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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Gypsum from
Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK


Locality type:Mine
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Comments:Crystals to 1mm.
Habit:Prismatic
Colour:Colourless-white
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Rare
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals:
Associates:Quartz
Sphalerite
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Data Identifiers
Mindat Occurrence Record ID:39320
Long-form Identifier:1:3:39320:1
GUID (UUID V4):0
Nearest other occurrences of Gypsum
2.4km (1.5 miles) ⓘGwaithgoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
4.0km (2.5 miles) ⓘCwmrheidol Mine, Ystumtuen, Cwmrheidol, Ceredigion, Wales, UK
8.3km (5.2 miles) ⓘGoginan Mine, Goginan, Melindwr, Ceredigion, Wales, UK
20.3km (12.6 miles) ⓘLodge Park Trial, Tre'r-ddol, Llangynfelyn, Ceredigion, Wales, UK
24.0km (14.9 miles) ⓘDylife Mine (Pen Dylife Mine; Esgairgaled Mine; Llechwedd Ddu Mine; Blaen Twymyn Mine), Dylife, Machynlleth, Powys, Wales, UK
34.7km (21.5 miles) ⓘOgofau Mine (Roman Deep Mine; Dolaucothi Mine; Cothy Mine), Pumpsaint, Carmarthenshire, Wales, UK
42.2km (26.2 miles) ⓘBrynycastell Mine, Dolgellau, Gwynedd, Wales, UK
45.5km (28.2 miles) ⓘTrial level, Vigra Mine, Llanelltyd, Gwynedd, Wales, UK
54.3km (33.8 miles) ⓘDolyhir Quarry, Old Radnor, Powys, Wales, UK
57.7km (35.9 miles) ⓘCastell Carn Dochan, Llanuwchllyn, Gwynedd, 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
Rust, Steve A. (2019) Minerals of the Frongoch Mine. Published by the author, 180 pages. ISBN 978-1-9162641-0-6.
 
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