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


03433860017272036894136.jpg
Rosasite, etc.

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
03433860017272036894136.jpg
Rosasite, etc.

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
03433860017272036894136.jpg
Rosasite, etc.

Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Locality type:Mine
Classification
Species:Rosasite
Formula:(Cu,Zn)2(CO3)(OH)2
Comments:Pale blue-green balls to 1.5mm on hemimorphite (XRD), with aurichalcite.
Habit:Botryoidal
Colour:Light blue-green
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Very Rare
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Confirmation Details:Where Tested and Reference ID: NHM London
Associated Minerals:
Associates:Aurichalcite
Hemimorphite
Associated Minerals Based on Photo Data:
Hemimorphite1
Data
Mineral Data:Click here to view Rosasite data
Locality Data:Click here to view Frongoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
Data Identifiers
Mindat Occurrence Record ID:39323
Long-form Identifier:1:3:39323:8
GUID (UUID V4):0
Nearest other occurrences of Rosasite
10.1km (6.3 miles) ⓘGwaith Yr Afon mine (West Cwmsymlog Mine; Cwm Daren Mine; River Mine; Taliesan Mine), Goginan, Trefeirig, Ceredigion, Wales, UK
61.0km (37.9 miles) ⓘLlangynog Mine, Llangynog, Powys, Wales, UK
61.5km (38.2 miles) ⓘCraig Rhiwarth Mine (Ochrycraig; North Llangynog), Llangynog, Powys, Wales, UK
98.5km (61.2 miles) ⓘBute Quarry, Llantrisant, Rhondda Cynon Taf, Wales, UK
98.9km (61.4 miles) ⓘMachen quarry, Machen, Caerphilly, Wales, UK
99.0km (61.5 miles) ⓘHendy Quarry, Llantrisant, Rhondda Cynon Taf, 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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