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


03822610017362886802110.jpg
Pyromorphite, etc.

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
04418290017272019742686.jpg
Pyromorphite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
02009270017272019752955.jpg
Pyromorphite, etc.

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
00772290017272019765022.jpg
Pyromorphite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
03121920017368289974269.jpg
Pyromorphite, etc.

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
04418290017272019742686.jpg
Pyromorphite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
02009270017272019752955.jpg
Pyromorphite, etc.

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
00772290017272019765022.jpg
Pyromorphite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
02339320017367403001596.jpg
Pyromorphite, etc.

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
04418290017272019742686.jpg
Pyromorphite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
02009270017272019752955.jpg
Pyromorphite, etc.

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
00772290017272019765022.jpg
Pyromorphite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Locality type:Mine
Classification
Species:Pyromorphite
Formula:Pb5(PO4)3Cl
Comments:Brown crystals to 2.5cms (XRD) with cerussite. Rare green microcrystals.
Habit:Prismatic, and blocky
Colour:Colourless-white, shades of light brown, yellow, slightly purple, rarely green
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Rare
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Confirmation Details:Where Tested and Reference ID: NHM London
Associated Minerals Based on Photo Data:
Quartz2
Hemimorphite1
Data
Mineral Data:Click here to view Pyromorphite data
Locality Data:Click here to view Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Photo GalleryView Gallery (14 photos)
Data Identifiers
Mindat Occurrence Record ID:18311
Long-form Identifier:1:3:18311:8
GUID (UUID V4):0
Nearest other occurrences of Pyromorphite
3.3km (2.1 miles) ⓘLogaulas Mine (Lisburne Mine; Logylas Mine), Lisburne Lead and Silver Mines, Ysbyty Ystwyth, Ceredigion, Wales, UK
4.4km (2.7 miles) ⓘEast Glogfach mine, Ysbyty Ystwyth, Ceredigion, Wales, UK
4.5km (2.8 miles) ⓘBodcoll Mine (Gertrude Mine; South Wales Mine), Devil's Bridge, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
4.6km (2.9 miles) ⓘGlogfawr Mine, Lisburne Lead and Silver Mines, Ysbyty Ystwyth, Ceredigion, Wales, UK
4.7km (2.9 miles) ⓘHendre Felen Mine (Hendre quarry), Ysbyty Ystwyth, Ceredigion, Wales, UK
4.9km (3.1 miles) ⓘEast Glogfawr mine, Ysbyty Ystwyth, Ceredigion, Wales, UK
6.6km (4.1 miles) ⓘLlywernog Mine (Ponterwyd Mine), Ponterwyd, Cwmrheidol, Ceredigion, Wales, UK
8.1km (5.0 miles) ⓘPengarigddu Mine, Goginan, Melindwr, Ceredigion, Wales, UK
8.2km (5.1 miles) ⓘCwmystwyth Mine, Cwmystwyth, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
8.4km (5.2 miles) ⓘFlorida Mine (Abbey Consols Mine; Bronberllan Mine), Pontrhydfendigaid, Ceredigion, Wales, UK
References
Greg, Robert Philips, Lettsom, William G. (1858) Manual of the Mineralogy of Great Britain and Ireland. John Van Voorst, London.
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
Day, Harry (1999) BMS Database, British Micromount Society.
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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