Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Unnamed (Pb Silicate) ? from
Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK


08965440017271929546799.jpg
Unnamed (Pb Silicate) ?

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
08965440017271929546799.jpg
Unnamed (Pb Silicate) ?

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
08965440017271929546799.jpg
Unnamed (Pb Silicate) ?

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Locality type:Mine
Classification
Species:'Unnamed (Pb Silicate) ?' (not an IMA approved species)
Formula:Pb, Si, O, H (?)
Comments:Although the crystals from this mine have been confirmed as an unknown species, it is believed by S.Rust that it may turn out to be Steverustite since the original element analysis may have been incorrect. Having said that, although the specimen submitted for the steverustite paper did have minute crystals of a Pb silicate on it, the latter crystals were far too small to do any descriptive work.
Habit:Lath-like
Colour:White
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Very Rare
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Unnamed (Pb Silicate) ? data
Locality Data:Click here to view Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Data Identifiers
Mindat Occurrence Record ID:60563
Long-form Identifier:1:3:60563:8
GUID (UUID V4):0
Nearest other occurrences of Unnamed (Pb Silicate) ?
16.9km (10.5 miles) ⓘEsgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
References
Green, D.I., Rust, S.A., Mason, J.S. (1996) Classic British mineral localities: Frongoch mine, Dyfed. UK Journal of Mines and Minerals 17, Rockbottom Publications. 29-39
 
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