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Ceredigion (Dyfed; Cardiganshire), Wales, UK

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Following the reorganisation of 1996, the Unitary Authorities of Ceredigion, Carmarthenshire and Pembrokeshire were formed from the administrative county of Dyfed when it was dissolved back into its original component traditional counties (Ceredigion is the Welsh name for the English Cardiganshire).

The administrative county of Dyfed was itself only formed during the 1974 administrative reorganisation from the traditional counties of Pembrokeshire, Carmarthenshire and Cardiganshire that date back to the middle ages.

Locations in this section are within the part of the current Unitary Authority of Dyfed that previously formed Cardiganshire and specimens from these locations may be labelled as Ceredigion, Dyfed or Cardiganshire depending upon the period that they were collected.

Locations in the parts of the Unitary Authority of Dyfed that previously formed Pembrokeshire or Carmarthenshire are listed seperately within those sections.




Mineral list contains entries from the region specified including sub-localities


Mineral List:
  		•  Agardite-(Y)
    (Y,Ca)Cu
     
    6
    		[(OH)
     
    6
    		|(AsO
     
    4
    		,HAsO
     
    4
    		)|(AsO
     
    4
    		)
     
    2
    		] · 3H
     
    2
    		O
    Reference: [S.Rust collection]
    Site Photo
    Gwaith Yr Afon mine (West Cwmsymlog Mine; Cwm Daren Mine; River Mine; Taliesan Mine), Goginan, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Habit: Tabular
    Colour: Colourless-white
    Description: Colourless-white xls to 0.5mm, associated with rutile and quartz.
    Reference: [S Rust Collection]
    Site Photo
    Daren Mine (Old Daren Mine; Darren Consolidated Mine; Daren United Mine; Great Darren Mine; Darren Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Anglesite
    PbSO
     
    4
    Reference: [No reference listed]
    Site Photo
    Daren Mine (Old Daren Mine; Darren Consolidated Mine; Daren United Mine; Great Darren Mine; Darren Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Ankerite
    Ca(Fe
    2+
     
    		 ,Mg,Mn
    2+
     
    		)(CO
     
    3
    		)
     
    2
    Habit: Rhombic crystals, massive
    Colour: Creamy, brown
    Description: Found as large blocks on the dumps. Cavites to several cms are lined with rhombic crystals to 8mm.
    Reference: [BMS Database]
  		•  Antigorite
    (Mg,Fe
    2+
     
    		)
     
    3
    		[(OH)
     
    4
    		|Si
     
    2
    		O
     
    5
    		]
    Habit: Rossets
    Colour: Pale blue-green
    Description: Pale blue green platy xls to 1mm (XRD).Grown on brochantite, a very unusual association.
    Reference: [UKJMM 5]
  		•  'Apatite'
    Habit: Tabular
    Colour: Colourless-white
    Reference: [S.Rust collection]
    Site Photo
    Bryn-yr-Afr Mine, Nant-y-Moch Reservoir area, Ponterwyd, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Aragonite
    CaCO
     
    3
    Reference: []
    Site Photo
    Henfwlch Mine, Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Arseniosiderite
    Ca
     
    2
    		Fe
    3+
    3
    		[O
     
    2
    		|(AsO
     
    4
    		)
     
    3
    		] · 3H
     
    2
    		O
    Reference: [S Rust collection]
    Site Photo
    Gwaith Yr Afon mine (West Cwmsymlog Mine; Cwm Daren Mine; River Mine; Taliesan Mine), Goginan, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Aurichalcite
    (Zn,Cu)
     
    5
    		[(OH)
     
    3
    		|CO
     
    3
    		]
     
    2
    Reference: [No reference listed]
    Site Photo
    Castell Mine (Dyffryn Castell Mine; New Castell Mine; West Esgairlle Mine; Gwaithddu Mine; Cripiau Bach Mine), Ponterwyd, Cwmrheidol, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Azurite
    Cu
     
    3
    		[OH|CO
     
    3
    		]
     
    2
    Reference: [No reference listed]
    Site Photo
    Lletty Evanhen Mine (Vaughan Mine), Bontgoch, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Baryte
    BaSO
     
    4
    Reference: [J Lamond Micro Collection (acquired from H Critchley)]
  		•  Bayldonite
    Cu
     
    3
    		Pb[OH|AsO
     
    4
    		]
     
    2
    Reference: [No reference listed]
    Site Photo
    Gwaith Yr Afon mine (West Cwmsymlog Mine; Cwm Daren Mine; River Mine; Taliesan Mine), Goginan, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Beaverite
    Pb(Fe
    3+
     
    		,Cu,Al)
     
    3
    		[(OH)
     
    3
    		|SO
     
    4
    		]
     
    2
    Habit: Botryoidal
    Colour: Light brown
    Reference: [BMS Database, UKJMM No18]
    Site Photo
    Ystrad Einion Mine (Dolgoch Mine), Furnace, Ysgubor-y-coed, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Bechererite
    (Zn,Cu)
     
    6
    		Zn
     
    2
    		[(OH)
     
    12
    		|(SO
     
    4
    		,HSiO
     
    4
    		)
     
    2
    		]
    Habit: Prismatic
    Colour: Colourless to blue-green
    Description: Colourless to light blue green prismatic cone-like xls to 1mm (XRD). Associated with caledonite, hemimorphite, cerussite, susannite.
    Reference: [UKJMM.23.2003]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Beudantite
    PbFe
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|AsO
     
    4
    		]
    Habit: Druset crusts
    Colour: Yellow-brown
    Reference: [BMS Database, UKJMM No18]
    Site Photo
    Ystrad Einion Mine (Dolgoch Mine), Furnace, Ysgubor-y-coed, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Bindheimite
    Pb
     
    2
    		Sb
     
    2
    		O
     
    6
    		(O,OH)
    Habit: Massive, powdery
    Colour: Shades of yellow
    Reference: [No reference listed]
    Site Photo
    Hendre Felen Mine, Ysbyty Ystwyth, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Bornite
    Cu
     
    5
    		FeS
     
    4
    Colour: iridescent
    Reference: [M.M.Wirth collection]
  		•  Bottinoite
    Ni
    2+
     
    		[Sb(OH)
     
    6
    		]
     
    2
    		 · 6H
     
    2
    		O
    Habit: Platy
    Colour: Light blue-green
    Description: Thin platy xls to 2mm (XRD)
    Reference: [BMS Database]
    Site Photo
    Hendre Felen Mine, Ysbyty Ystwyth, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Boulangerite
    Pb
     
    5
    		Sb
     
    4
    		S
     
    11
    Reference: [BMS Database]
  		•  Bournonite
    PbCuSbS
     
    3
    Habit: Massive
    Reference: [BMS Database]
  		•  Brianyoungite
    Zn
     
    3
    		[(OH)
     
    4
    		|(CO
     
    3
    		,SO
     
    4
    		)]
    Colour: White
    Reference: [Journal of the Russell Society No 8.]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Brochantite
    Cu
     
    4
    		[(OH)
     
    6
    		|SO
     
    4
    		]
    Colour: green
    Reference: [M.M.Wirth collection]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Calcite
    CaCO
     
    3
    Description: Sphalerite can be readily collected from the lower tips in very large pieces, but sadly crystals are rare. Good pyromorphite at higher levels, but better still at nearby Copa Hill.
    Reference: [D Vesty collection]
  		•  Caledonite
    Cu
     
    2
    		Pb
     
    5
    		[(OH)
     
    6
    		|CO
     
    3
    		|(SO
     
    4
    		)
     
    3
    		]
    Description: Almost white to light blue divergent xl groups to 5mm. Associated with hydrocerussite, susannite, and an unknown mineral.
    Reference: [BMS Database]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Cerussite
    PbCO
     
    3
    Reference: [Specimen in the Natural History Museum, London]
    Site Photo
    Bwlch Glas Mine, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Cesàrolite
    PbH
     
    2
    		Mn
     
    3
    		O
     
    8
    Reference: [Cotterell, T.F., 2006. The first British occurrence of cesarolite at Eaglebrook Mine, Ceulanymaesmawr, Ceredigion, Wales. UK Journal of Mines and Minerals, 27, 36-38.]
  		•  Chalcocite
    Cu
     
    2
    		S
    Habit: Massive
    Description: Replacement of chalcopyrite
    Reference: [No reference listed]
  		•  Chalcophanite
    (Zn,Fe,Mn)Mn
     
    3
    		O
     
    7
    		·3H
     
    2
    		O
    Reference: []
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Chalcophyllite
    Cu
     
    18
    		Al
     
    2
    		[(OH)
     
    9
    		|SO
     
    4
    		|AsO
     
    4
    		]
     
    3
    		 · 33H
     
    2
    		O
    Reference: [S.Rust collection]
  		•  Chalcopyrite
    CuFeS
     
    2
    Reference: [No reference listed]
    Site Photo
    Hendre Felen Mine, Ysbyty Ystwyth, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Chenite
    Pb
     
    4
    		Cu[(OH)
     
    3
    		|SO
     
    4
    		]
     
    2
    Habit: Platy
    Colour: Pale sky blue
    Description: Tiny platy crystals to 0.5mm, only two specimens known.
    Reference: [UKJMM 18]
    Site Photo
    Esgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  'Chlorite Group'
    Habit: Rosets
    Colour: Pale grey green
    Description: Crystal groups to 0.7mm
    Reference: [UKJMM No5]
  		•  Chrysocolla
    (Cu,Al)
     
    2
    		H
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    		·nH
     
    2
    		O
    Habit: Thin crusts
    Colour: White-green
    Reference: [UKJMM No5]
    Site Photo
    Lodge Park Trial, Tre'r-ddol, Llangynfelyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Cinnabar
    HgS
    Habit: Powdery
    Colour: Red, orange red
    Reference: [Braithwaite, R.S.W. (1982): Pyromorphite, wulfenite and other minerals from the Bwlch-Glas mine central Wales. Mineralogical Record 13: 151-153]
  		•  Connellite
    Cu
     
    19
    		[(OH)
     
    32
    		|SO
     
    4
    		|Cl
     
    4
    		] · 3H
     
    2
    		O
    Habit: Balls
    Colour: Deep blue
    Description: Deep blue balls to 1mm with radial structure.
    Reference: [S Rust collection]
    Site Photo
    Lodge Park Trial, Tre'r-ddol, Llangynfelyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Copper
    Cu
    Description: Sphalerite can be readily collected from the lower tips in very large pieces, but sadly crystals are rare. Good pyromorphite at higher levels, but better still at nearby Copa Hill.
    Reference: [D Vesty collection]
    Site Photo
    Lodge Park Trial, Tre'r-ddol, Llangynfelyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Corkite
    PbFe
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|PO
     
    4
    		]
    Reference: [National Museum of Wales database. Cotterell, T.F. and Todhunter, P.K., 2007. Corkite and hinsdalite from Frongoch mine, Devil's Bridge, Ceredigion, Wales, including evidence to suggest that orpheite is a variety of hinsdalite. Journal of the Russell Society, 10, 57-64. ]
  		•  Covellite
    CuS
    Colour: black,iridescent
    Description: frequent black coating on sphalerite. Dissolves in HCl to give green crystals of copper chloride which coat steel wool fibre with copper.
    Reference: [M.M.Wirth collection]
  		•  Cuprite
    Cu
     
    2
    		O
    Habit: Rounded masses, octahedral crystals
    Colour: Deep maroon
    Description: Tiny xls to 0.15mm.
    Reference: [UKJMM No5]
    Site Photo
    Lodge Park Trial, Tre'r-ddol, Llangynfelyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Descloizite
    Pb(Zn,Cu)[OH|VO
     
    4
    		]
    Description: Mixture with linarite & brochantite after lautenthalite xls ? (XRD)
    Reference: [S Rust collection ]
  		•  Devilline
    CaCu
     
    4
    		(SO
     
    4
    		)
     
    2
    		(OH)
     
    6
    		·3H
     
    2
    		O
    Habit: Lath like
    Reference: [BMS Database]
  		•  Dolomite
    CaMg(CO
     
    3
    		)
     
    2
    Habit: Massive
    Colour: Creamy, brown
    Description: Major vein mineral at Esgair Fraith.
    Reference: [UKJMM No5]
  		•  Dolomite
    var: Ferroan Dolomite
    Reference: []
    Site Photo
    Castell Mine (Dyffryn Castell Mine; New Castell Mine; West Esgairlle Mine; Gwaithddu Mine; Cripiau Bach Mine), Ponterwyd, Cwmrheidol, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Dundasite
    PbAl
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
     
    2
    		 · H
     
    2
    		O
    Reference: [BMS Database]
  		•  Elyite
    Pb
     
    4
    		Cu(SO
     
    4
    		)O
     
    2
    		(OH)
     
    4
    		·H
     
    2
    		O
    Habit: Lath like
    Colour: Pale purple to purple
    Description: Occurs as pale purple lath-like xls to 0.2mm in groups to 2mm, with an unknown mineral.
    Reference: [UKJMM No5]
    Site Photo
    Llechwedd Helyg Mine (Willow Bank Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Erythrite
    Co
     
    3
    		(AsO
     
    4
    		)
     
    2
    		·8H
     
    2
    		O
    Habit: Thin crusts
    Colour: Pale pink
    Description: Thin pale pink crusts to afew mm.
    Reference: [BMS Database]
    Site Photo
    Daren Mine (Old Daren Mine; Darren Consolidated Mine; Daren United Mine; Great Darren Mine; Darren Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Fluorite ?
    CaF
     
    2
    Reference: [The Old Metal Mines of Mid-Wales, Part 3, pp38. ]
  		•  Galena
    PbS
    Reference: []
    Site Photo
    Henfwlch Mine, Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Goethite
    α-Fe
    3+
     
    		O(OH)
    Reference: []
  		•  Gold
    Au
    Habit: Massive
    Description: Micron masses in polished ore samples
    Reference: []
  		•  Greenockite
    CdS
    Reference: [No reference listed]
  		•  Gypsum
    Ca[SO
     
    4
    		] · 2H
     
    2
    		O
    Habit: Prismatic
    Colour: Colourless-white
    Description: Xls to 1mm
    Reference: [UKJMM 17]
  		•  Hemimorphite
    Zn
     
    4
    		[(OH)
     
    2
    		|Si
     
    2
    		O
     
    7
    		] · H
     
    2
    		O
    Reference: [No reference listed]
    Site Photo
    Cwmystwyth Mine, Cwmystwyth, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
     
  		•  Hinsdalite
    PbAl
     
    3
    		[(OH)
     
    6
    		|SO
     
    4
    		|PO
     
    4
    		]
    Reference: [Cotterell, T.F. and Todhunter, P.K., 2007. Corkite and hinsdalite from Frongoch mine, Devil's Bridge, Ceredigion, Wales, including evidence to suggest that orpheite is a variety of hinsdalite. Journal of the Russell Society, 10, 57-64. ]
  		•  Hydrocerussite
    Pb
     
    3
    		(CO
     
    3
    		)
     
    2
    		(OH)
     
    2
    Habit: Crusts
    Colour: Whiteish
    Description: Thin colourless to white pearly platy crusts to afew cms.
    Reference: [BMS Database]
    Site Photo
    Esgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Hydrozincite
    Zn
     
    5
    		[(OH)
     
    3
    		|CO
     
    3
    		]
     
    2
    Reference: [No reference listed]
    Site Photo
    Castell Mine (Dyffryn Castell Mine; New Castell Mine; West Esgairlle Mine; Gwaithddu Mine; Cripiau Bach Mine), Ponterwyd, Cwmrheidol, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Jamborite
    (Ni
    2+
     
    		,Ni
    3+
     
    		,Co,Fe)(OH)
     
    2
    		(OH,S,H
     
    2
    		O)
    Habit: Crusts
    Colour: Yellowish green
    Description: Occurs as a replacement of millerite
    Reference: [S Rust collection]
    Site Photo
    Bryn-yr-Afr Mine, Nant-y-Moch Reservoir area, Ponterwyd, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Jarosite
    KFe
    3+
     
     
    3
    		[(OH)
     
    3
    		|SO
     
    4
    		]
     
    2
    Reference: [No reference listed]
  		•  Ktenasite
    Zn(Cu,Zn)
     
    4
    		[(OH)
     
    6
    		|(SO
     
    4
    		)
     
    2
    		] · 6H
     
    2
    		O
    Habit: Tabular
    Colour: Blue green
    Reference: [BMS Database, UKJMM No18]
    Site Photo
    Ystrad Einion Mine (Dolgoch Mine), Furnace, Ysgubor-y-coed, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Lanarkite
    Pb
     
    2
    		[O|SO
     
    4
    		]
    Habit: Bladed
    Colour: Off white
    Description: Slightly tinted yellowish to colourless xl sprays to 5mm (XRD), on galena with susannite.
    Reference: [UKJMM 17]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Langite
    Cu
     
    4
    		[(OH)
     
    6
    		|SO
     
    4
    		] · 2H
     
    2
    		O
    Reference: [No reference listed]
    Site Photo
    Esgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Laurionite
    PbClOH
    Habit: Bladed
    Colour: White-colourless
    Description: Colourless to white 1cm bladed xl mass (XRD), associated with caledonite, and cerussite. Ex Steve Burchmore specimen.
    Reference: [UKJMM]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Lautenthalite
    PbCu
     
    4
    		(SO
     
    4
    		)
     
    2
    		(OH)
     
    6
    		·3H
     
    2
    		O
    Habit: Platy
    Colour: Emerald green
    Reference: [S Rust collection]
    Site Photo
    Brynarian Mine (Cardigan Bay Consols Mine), Tre-Taliesin, Llangynfelyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Leadhillite
    Pb
     
    4
    		SO
     
    4
    		(CO
     
    3
    		)
     
    2
    		(OH)
     
    2
    Reference: [No reference listed]
    Site Photo
    Cwmystwyth Mine, Cwmystwyth, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Limonite
    FeO(OH)·nH
     
    2
    		O
    Habit: Massive
    Reference: [UKJMM 3]
  		•  Linarite
    PbCu[(OH)
     
    2
    		|SO
     
    4
    		]
    Reference: [No reference listed]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Litharge
    PbO
    Habit: Pseudomorphs after ?
    Colour: Scarlet
    Fluorescence: None
    Description: Scarlet xls to 0.5mm on cerussite (XRD), with cerussite.
    Reference: [BMS Database, UKJMM 17]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Malachite
    Cu
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
    Description: Sphalerite can be readily collected from the lower tips in very large pieces, but sadly crystals are rare. Good pyromorphite at higher levels, but better still at nearby Copa Hill.
    Reference: [D Vesty collection]
    Site Photo
    Castell Mine (Dyffryn Castell Mine; New Castell Mine; West Esgairlle Mine; Gwaithddu Mine; Cripiau Bach Mine), Ponterwyd, Cwmrheidol, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Marcasite
    FeS
     
    2
    Reference: [BMS Database]
  		•  Mattheddleite
    Pb
     
    5
    		(Si
     
    1.5
    		S
     
    1.5
    		)O
     
    12
    		(Cl,OH)
    Habit: Prismatic
    Colour: Colourless
    Description: Colourless xls to 0.2mm (XRD), forming small masses to 3mm.
    Reference: [UKJMM 16:15]
    Site Photo
    Daren Mine (Old Daren Mine; Darren Consolidated Mine; Daren United Mine; Great Darren Mine; Darren Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Millerite
    NiS
    Habit: Prismatic
    Description: Xls to 3mm embedded in sulphides
    Reference: [UKJMM No5]
    Site Photo
    Bryn-yr-Afr Mine, Nant-y-Moch Reservoir area, Ponterwyd, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Mimetite
    Pb
     
    5
    		[Cl|(AsO
     
    4
    		)
     
    3
    		]
    Habit: Crystalline masses
    Colour: Pale green
    Description: pale green xl masses to 2mm.
    Reference: [BMS Database]
    Site Photo
    Hendre Felen Mine, Ysbyty Ystwyth, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Muscovite
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Habit: Thin platy rossets
    Description: Off white crystal rossets to 1mm, commly staind yellow and red by Fe oxides.
    Reference: [S.Rust collection]
  		•  Namuwite
    (Zn,Cu)
     
    4
    		[(OH)
     
    6
    		|SO
     
    4
    		] · 4H
     
    2
    		O
    Reference: []
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Olivenite
    Cu
     
    2
    		[OH|AsO
     
    4
    		]
    Reference: [No reference listed]
    Site Photo
    Gwaith Yr Afon mine (West Cwmsymlog Mine; Cwm Daren Mine; River Mine; Taliesan Mine), Goginan, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Parnauite
    Cu
     
    9
    		[(OH)
     
    10
    		|SO
     
    4
    		|(AsO
     
    4
    		)
     
    2
    		] · 7H
     
    2
    		O
    Reference: [Rust S.A. & Mason, J.S.(1994): An unusual occurrence of arsenate minerals at Gwaith-yr-Afon mine, Dyfed, Walws. J.of the Russell Society, 5(2),109-113.]
  		•  Pharmacosiderite
    KFe
    3+
    4
    		[(OH)
     
    4
    		|(AsO
     
    4
    		)
     
    3
    		] · 6-7H
     
    2
    		O
    Reference: [No reference listed]
  		•  Phlogopite
    KMg
     
    3
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Description: Showen up on XRD with mixed mineral phases, including cerussite, and dolomite.
    Reference: [UKJMM No5]
  		•  Phosgenite
    Pb
     
    2
    		[Cl
     
    2
    		|CO
     
    3
    		]
    Habit: Prismatic rods, blocky pseudocubic.
    Colour: White-colourless, tinted brown.
    Description: Translucent tinted brown xls to 1mm, associated with cerussite.
    Reference: [S Rust Collection]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Posnjakite
    Cu
     
    4
    		[(OH)
     
    6
    		|SO
     
    4
    		] · H
     
    2
    		O
    Reference: [No reference listed]
    Site Photo
    Cwmystwyth Mine, Cwmystwyth, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © R.D.Green
  		•  Pyrite
    FeS
     
    2
    Reference: [BMS Database]
    Site Photo
    Castell Mine (Dyffryn Castell Mine; New Castell Mine; West Esgairlle Mine; Gwaithddu Mine; Cripiau Bach Mine), Ponterwyd, Cwmrheidol, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Pyrolusite
    MnO
     
    2
    Reference: [No reference listed]
  		•  Pyromorphite
    Pb
     
    5
    		[Cl|(PO
     
    4
    		)
     
    3
    		]
    Reference: [Specimen in the Natural History Museum, London]
    Site Photo
    Bwlch Glas Mine, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Pyrrhotite
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Reference: [No reference listed]
  		•  Quartz
    SiO
     
    2
    Reference: [No reference listed]
    Site Photo
    Bryn-yr-Afr Mine, Nant-y-Moch Reservoir area, Ponterwyd, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Queitite
    Pb
     
    4
    		Zn
     
    2
    		[SO
     
    4
    		|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [No reference listed]
  		•  Ramsbeckite
    (Cu,Zn)
     
    15
    		[(OH)
     
    22
    		|(SO
     
    4
    		)
     
    4
    		] · 6H
     
    2
    		O
    Reference: [S.Rust Collection]
    Site Photo
    Penrhiw Mine (Penyberth Mine), Ystumtuen, Cwmrheidol, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Ramsdellite
    Mn
    4+
     
    		O
     
    2
    Reference: [T.F. Cotterell, unpublished data]
  		•  Redgillite
    Cu
     
    6
    		[(OH)
     
    10
    		|SO
     
    4
    		] · H
     
    2
    		O
    Reference: [S.Rust Collection]
    Site Photo
    Esgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Rosasite
    (Cu,Zn)
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
    Reference: [No reference listed]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Rutile
    TiO
     
    2
    Habit: Acicular
    Colour: Yellow-brown
    Description: Acicular xls to 1mm with albite and quartz. Part of an early stage mineralisation befor the influx of the main sulphides.
    Reference: [BMS Database]
    Site Photo
    Bryn-yr-Afr Mine, Nant-y-Moch Reservoir area, Ponterwyd, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Schmiederite
    Pb
     
    2
    		Cu
     
    2
    		[(OH)
     
    4
    		|SeO
     
    3
    		|SeO
     
    4
    		]
    Description: Solid solution with linarite (EPMA)
    Reference: [Cardiff Museum]
    Site Photo
    Llechwedd Helyg Mine (Willow Bank Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Schulenbergite
    (Cu,Zn)
     
    7
    		[(OH)
     
    10
    		|(SO
     
    4
    		,CO
     
    3
    		)
     
    2
    		] · 3H
     
    2
    		O
    Reference: [S.Rust Collection]
    Site Photo
    Ystrad Einion Mine (Dolgoch Mine), Furnace, Ysgubor-y-coed, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Scorodite
    Fe
    3+
     
    		AsO
     
    4
    		·2H
     
    2
    		O
    Reference: [No reference listed]
    Site Photo
    Gwaith Yr Afon mine (West Cwmsymlog Mine; Cwm Daren Mine; River Mine; Taliesan Mine), Goginan, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Serpierite
    Ca(Cu,Zn)
     
    4
    		(SO
     
    4
    		)
     
    2
    		(OH)
     
    6
    		·3H
     
    2
    		O
    Habit: Lath-like
    Colour: White-pale sky blue
    Description: Lath-like pale light blue wispy xls to 0.7mm. Associated with brochantite, caledonite, linarite, susannite, schulenbergite,
    Reference: [UKJMM No5]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Siderite
    FeCO
     
    3
    Description: Sphalerite can be readily collected from the lower tips in very large pieces, but sadly crystals are rare. Good pyromorphite at higher levels, but better still at nearby Copa Hill.
    Reference: [D Vesty collection]
  		•  Siegenite
    from CoNi
     
    2
    		S
     
    4
    		 to NiCo
     
    2
    		S
     
    4
    Habit: Granular massive
    Colour: Dull bronzey
    Description: In polished ore sections, and granular masses to 1cm.
    Reference: [UKJMM No5]
    Site Photo
    Erglodd mine (Eurglawdd Mine), Tre-Taliesin, Llangynfelyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Silver
    Ag
    Habit: Dendritic
    Description: Single xl spray on cerussite
    Reference: [BMS Database, UKJMM 17]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Smithsonite
    ZnCO
     
    3
    Habit: needles
    Reference: [M.M.Wirth collection]
  		•  Sphalerite
    (Zn,Fe
    2+
     
    		)S
    Description: Sphalerite can be readily collected from the lower tips in very large pieces, but sadly crystals are rare. Good pyromorphite at higher levels, but better still at nearby Copa Hill.
    Reference: [D Vesty collection]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Steverustite (TL)
    Pb
    2+
    5
    		(OH)
     
    5
    		[Cu
    1+
     
    		(S
    6+
     
    		O
     
    3
    		S
    2-
     
    		)
     
    3
    		](H
     
    2
    		O)
     
    2
    Type Locality: Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    Habit: Lath-like crystals
    Colour: Colourless to White
    Reference: [Min.Mag.73,227-234(2009)]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Strontianite
    SrCO
     
    3
    Reference: [BMS Database]
  		•  Sulphur
    S
     
    8
    Reference: [No reference listed]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Susannite
    Pb
     
    4
    		SO
     
    4
    		(CO
     
    3
    		)
     
    2
    		(OH)
     
    2
    Habit: Pseudohexagonal
    Colour: White-creamy
    Description: Colourless to white xls to 0.6mm.
    Reference: [S Rust Collection]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Tenorite
    CuO
    Habit: Massive
    Colour: Black
    Reference: [BMS Database]
  		•  Tetrahedrite
    (Cu,Fe,Ag,Zn)
     
    12
    		Sb
     
    4
    		S
     
    13
    Habit: Massive, complex crystals
    Description: Xls to 1.2cms.
    Reference: [BMS Database]
    Site Photo
    Daren Mine (Old Daren Mine; Darren Consolidated Mine; Daren United Mine; Great Darren Mine; Darren Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Tučekite
    Ni
     
    9
    		Sb
     
    2
    		S
     
    8
    Habit: Imbedded micron size crystals
    Description: In polished ore sections
    Reference: [UKJMM No5]
  		•  Tyrolite
    Ca
     
    2
    		Cu
     
    9
    		[(OH)
     
    4
    		|(H
     
    2
    		O)
     
    11
    		|CO
     
    3
    		|(AsO
     
    4
    		)
     
    4
    		] · 0-1H
     
    2
    		O
    Reference: [No reference listed]
    Site Photo
    Gwaith Yr Afon mine (West Cwmsymlog Mine; Cwm Daren Mine; River Mine; Taliesan Mine), Goginan, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Ullmannite
    NiSbS
    Habit: Massive
    Description: In polished ore sections
    Reference: [UKJMM No5]
    Site Photo
    Mynydd Gorddu Mine, Bontgoch (Elerch), Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  'Unnamed (Basic Zinc Sulfate Hydrate)'
    Zn
     
    4
    		SO
     
    4
    		(OH)
     
    6
    		·4H
     
    2
    		O
    Habit: Very thin platy petal-like microcrystals
    Colour: Very pale sea green
    Reference: [Nat Hist London XRD file X4588F]
    Site Photo
    Eaglebrook Mine (Nant-Y-Cagel Mine; Nantycagl Mine; Nantygagal Mine; Dolrhyddlan Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  'Unnamed (Cu-Pb Silicate)'
    Pb, Cu, Si, O
    Habit: Feathery plume-like crystals
    Colour: Pale blue-royal blue
    Reference: [S. Rust collection]
    Site Photo
    Llechwedd Helyg Mine (Willow Bank Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  'Unnamed (Pb Silicate)'
    Pb, Si, O, H (?)
    Habit: Lath-like divergent and dendritic crystal groups to 1mm
    Colour: Colourless to mostly white
    Description: Found on approx 10-20 specimens, associated with susannite, cerussite, and anglesite
    Reference: [Cooper, M.A., Hawthorne, F.C., Moffatt, E. (2009): Steverustite, Pb2+5(OH)5(Cu1+(S6+O3S2-)3)H2O)2, a new thiosulphate mineral from the Frongoch Mine Dump, Devils Bridge, Ceredigion, Wales: Description and crystal structure. Mineralogical Magazine, 73, 235-250; S. Rust Collection, Nat Hist Museum London]
    Site Photo
    Frongoch Mine (Bron-y-Goch Mine; Llawynwnwch Mine), Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Violarite
    Fe
    2+
     
    		Ni
    3+
    2
    		S
     
    4
    Description: In polished ore sections
    Reference: [UKJMM No5]
  		•  'Wad'
    Reference: []
  		•  Woodwardite
    Cu
     
    4
    		Al
     
    2
    		[(OH)
     
    12
    		|SO
     
    4
    		] · 2-4H
     
    2
    		O
    Reference: [BMS Database]
  		•  Wroewolfeite
    Cu
     
    4
    		[(OH)
     
    6
    		|SO
     
    4
    		] · 2H
     
    2
    		O
    Habit: Bladed
    Colour: Light blue green
    Reference: [BMS Database]
    Site Photo
    Esgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Nant-y-Moch Reservoir area, Talybont, Ceulanymaesmawr, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust
  		•  Wulfenite
    Pb[MoO
     
    4
    		]
    Habit: Thin tabular
    Colour: Yellow to orange
    Description: Xls to 1mm with pyromorphite.
    Reference: [BMS Database]
    Site Photo
    Llechwedd Helyg Mine (Willow Bank Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion (Dyfed; Cardiganshire), Wales, UK
    © Steve Rust


    117 entries listed. 109 valid minerals. 1 type locality (valid mineral).

    Localities in this Region:
    UK
     
    • Wales
      • Ceredigion (Dyfed; Cardiganshire)
        • Pontrhydfendigaid
          • Bow Street
          • Bontgoch
          • Bow Street
          • Cwmerfyn
          • Cwmystwyth
          • Furnace
          • Ynystudor

    The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 27th Nov 2009 03:49:32