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Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd (Caernarvonshire), Wales, UK

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A small hamlet on the Lleyn Peninsular. Rhiw was originally in the parish of Rhiw, which was then incorporated into the adjoining parish of Llanfaelrhys.

There are the remains of two small manganese mines here that were worked in the early 1900s and again during the Second World War.

The type locality for Banalsite, Bannisterite, Cymrite and Pennantite and the location of some of the world's finest crystals of Paracelsian.




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

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
  		• 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
  		• Romanèchite4.DK.10
    (Ba,H
     
    2
    		O)
     
    2
    		Mn
     
    5
    		O
     
    10
    Group 5 - Nitrates and Carbonates
  		• Rhodochrosite5.AB.05
    MnCO
     
    3
  		• Strontianite5.AB.15
    SrCO
     
    3
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• 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
  		• 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
  		• 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
  		• Paracelsian9.FA.40
    Ba[Al
     
    2
    		Si
     
    2
    		O
     
    8
    		]
  		• Paragonite9.EC.15
    NaAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• 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
    		]
  		• Rhodonite9.DK.05
    MnSiO
     
    3
  		• Tephroite9.AC.05
    Mn
    2+
    2
    		[SiO
     
    4
    		]


    35 entries listed. 34 valid minerals.

    Localities in this Region:
    UK
     
    • Wales
      • Gwynedd (Caernarvonshire)
        • Lleyn Peninsula
          • Llanfaelrhys
            • Rhiw

    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: 26th Nov 2009 02:42:16