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Lleyn Peninsula, Gwynedd (Caernarvonshire), Wales, UK

StandardDetailedBy ChemistryMineral Photos (14)Search GoogleMineral Report for Region

The Lleyn Peninsula, an undulating spur reaching out from the mountains of Snowdonia, is the most westerly point of Gwynedd. Twenty five miles long, it averages eight miles in width, and separates Caernarfon and Cardigan Bays. It is bordered to the east by the A487 Caernarfon-Porthmadog road.

At various times manganese, iron and lead-copper mines have operated on the Lleyn.




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

Group 1 - Elements
  		• Sulphur1.CC.05
    S
     
    8
    Group 2 - Sulphides and Sulfosalts
  		• Bornite2.BA.15
    Cu
     
    5
    		FeS
     
    4
  		• Chalcopyrite2.CB.10a
    CuFeS
     
    2
  		• Galena2.CD.10
    PbS
    Group 3 - Halides
  		• Atacamite3.DA.10a
    Cu
     
    2
    		[(OH)
     
    3
    		|Cl]
  		• Botallackite3.DA.10b
    Cu
     
    2
    		[(OH)
     
    3
    		|Cl]
  		• Cotunnite3.DC.85
    PbCl
     
    2
  		• Cumengeite3.DB.20
    Pb
     
    21
    		Cu
     
    20
    		Cl
     
    42
    		(OH)
     
    40
    		·6H
     
    2
    		O
    Group 4 - Oxides and Hydroxides
  		• Birnessite4.FL.45
    (Na,Ca)
     
    0.5
    		(Mn
    4+
     
    		,Mn
    3+
     
    		)
     
    2
    		O
     
    4
    		 · 1.5H
     
    2
    		O
  		• Bixbyite4.CB.10
    (Mn
    3+
     
    		,Fe
    3+
     
    		)
     
    2
    		O
     
    3
  		• Brookite4.DD.10
    TiO
     
    2
  		• Feitknechtite4.FE.25
    Mn
    3+
     
    		O(OH)
  		• Hausmannite4.BB.10
    MnMn
     
    2
    		O
     
    4
  		• Iwakiite4.BB.10
    Mn(Fe,Mn)
     
    2
    		O
     
    4
  		• Jacobsite4.BB.05
    Mn
    2+
     
    		Fe
    3+
    2
    		O
     
    4
  		• Manganite4.FD.15
    Mn
    3+
     
    		O(OH)
  		• Manganosite4.AB.25
    MnO
  		• Pyrochroite4.FE.05
    Mn(OH)
     
    2
  		• Pyrolusite4.DB.05
    MnO
     
    2
  		• Pyrophanite4.CB.05
    Mn
    2+
     
    		TiO
     
    3
  		• Quartz4.DA.05
    SiO
     
    2
  		• Romanèchite4.DK.10
    (Ba,H
     
    2
    		O)
     
    2
    		Mn
     
    5
    		O
     
    10
    Group 5 - Nitrates and Carbonates
  		• Calcite5.AB.05
    CaCO
     
    3
  		• Cerussite5.AB.15
    PbCO
     
    3
  		• Phosgenite5.BE.20
    Pb
     
    2
    		[Cl
     
    2
    		|CO
     
    3
    		]
  		• Rhodochrosite5.AB.05
    MnCO
     
    3
  		• Strontianite5.AB.15
    SrCO
     
    3
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Anglesite7.AD.35
    PbSO
     
    4
  		• Baryte7.AD.35
    BaSO
     
    4
  		• Powellite7.GA.05
    Ca[MoO
     
    4
    		]
    Group 8 - Phosphates, Arsenates and Vanadates
  		• Apatite-(CaF)8.BN.05
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
    Group 9 - Silicates
  		• Alleghanyite9.AF.45
    Mn
    2+
    5
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
  		• Analcime9.GB.05
    Na
     
    2
    		[Al
     
    2
    		Si
     
    4
    		O
     
    12
    		] · 2H
     
    2
    		O
  		• Axinite-(Fe)9.BD.20
    Ca
     
    2
    		Fe
    2+
     
    		Al
     
    2
    		[OH|BSi
     
    4
    		O
     
    15
    		]
  		• Banalsite (TL)9.FA.60
    BaNa
     
    2
    		[Al
     
    2
    		Si
     
    2
    		O
     
    8
    		]
     
    2
  		• Bannisterite (TL)9.EG.75
    Ca
     
    0.5
    		(K,Na)
     
    0.5
    		(Mn,Fe,Zn)
     
    10
    		(Si,Al)
     
    16
    		O
     
    38
    		(OH)
     
    8
    		·5.5H
     
    2
    		O
  		• Caryopilite9.ED.15
    (Mn,Mg)
     
    3
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
  		• Celsian9.FA.30
    Ba[Al
     
    2
    		Si
     
    2
    		O
     
    8
    		]
  		• Cymrite (TL)9.EG.05
    BaAl
     
    2
    		Si
     
    2
    		(O,OH)
     
    8
    		·H
     
    2
    		O
  		• Epidote9.BG.05
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
  		• Ganophyllite9.EG.30
    (K,Na,Ca)
     
    2
    		Mn
     
    8
    		(Si,Al)
     
    12
    		(O,OH)
     
    32
    		·8H
     
    2
    		O
  		• Harmotome9.GC.10
    (Ba
     
    0.5
    		,Ca
     
    0.5
    		,K,Na)
     
    5
    		[Al
     
    5
    		Si
     
    11
    		O
     
    32
    		] ·12H
     
    2
    		O
  		• Hyalophane9.FA.30
    (K,Ba)[Al(Si,Al)Si
     
    2
    		O
     
    8
    		]
  		• Natrolite9.GA.05
    Na
     
    2
    		[Al
     
    2
    		Si
     
    3
    		O
     
    10
    		] · 2H
     
    2
    		O
  		• Neotocite9.ED.20
    (Mn,Fe,Mg)SiO
     
    3
    		·H
     
    2
    		O
  		• Paracelsian9.FA.40
    Ba[Al
     
    2
    		Si
     
    2
    		O
     
    8
    		]
  		• Paragonite9.EC.15
    NaAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Pectolite9.DG.05
    NaCa
     
    2
    		[HSi
     
    3
    		O
     
    9
    		]
  		• Pennantite (TL)9.EC.55
    (Mn
     
    5
    		Al)(Si
     
    3
    		Al)O
     
    10
    		(OH)
     
    8
  		• Piemontite9.BG.05
    {Ca
     
    2
    		}{Al
     
    2
    		Mn
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
  		• Piemontite-(Sr)9.BG.05
    {CaSr}{Al
     
    2
    		Mn
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
  		• Prehnite9.DP.20
    Ca
     
    2
    		Al
     
    2
    		Si
     
    3
    		O
     
    12
    		(OH)
  		• Pyroxmangite9.DO.05
    MnSiO
     
    3
  		• Rhodonite9.DK.05
    MnSiO
     
    3
  		• Stevensite9.EC.45
    (Ca,Na)
     
    x
    		Mg
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
  		• Tephroite9.AC.05
    Mn
    2+
    2
    		[SiO
     
    4
    		]
    Unclassified Minerals
  		• 'Apophyllite'-


    57 entries listed. 54 valid minerals.

    Localities in this Region:
    UK
     
    • Wales
      • Gwynedd (Caernarvonshire)
        • Lleyn Peninsula
            • Llanengan
            • Nant-y-Gadwen
            • Porth Dinllaen
          • Pwllheli

    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 15:19:24