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


08743470017370131061043.jpg
Lanarkite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
05281530017370131073002.jpg
Lanarkite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
05249700017272737824770.jpg
Lanarkite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
06783410017272019607339.jpg
Lanarkite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
05249700017272737824770.jpg
Lanarkite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
06783410017272019607339.jpg
Lanarkite

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Locality type:Mine
Classification
Species:Lanarkite
Formula:Pb2(SO4)O
Comments:Slightly tinted yellowish to colourless crystal sprays to 5mm (XRD), on galena with susannite. The first occurrence of Lanarkite in Wales.
Habit:Bladed
Colour:Off white
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Very Rare
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Confirmation Details:Where Tested and Reference ID: Oxford University Museum
Associated Minerals:
Associates:Covellite
Galena
Susannite
Data
Mineral Data:Click here to view Lanarkite data
Locality Data:Click here to view Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:39463
Long-form Identifier:1:3:39463:5
GUID (UUID V4):0
Nearest other occurrences of Lanarkite
11.2km (6.9 miles) ⓘLlechwedd Helyg Mine (Willow Bank Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion, Wales, UK
54.3km (33.8 miles) ⓘDolyhir Quarry, Old Radnor, Powys, 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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