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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Posnjakite from
Penrhiw Mine (Penyberth Mine), Ystumtuen, Cwmrheidol, Ceredigion, Wales, UK


Locality type:Mine
Classification
Species:Posnjakite
Formula:Cu4(SO4)(OH)6 · H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Posnjakite data
Locality Data:Click here to view Penrhiw Mine (Penyberth Mine), Ystumtuen, Cwmrheidol, Ceredigion, Wales, UK
Data Identifiers
Mindat Occurrence Record ID:8802
Long-form Identifier:1:3:8802:2
GUID (UUID V4):0
Nearest other occurrences of Posnjakite
7.6km (4.7 miles) ⓘLletty Evanhen Mine (Vaughan Mine), Bontgoch, Trefeirig, Ceredigion, Wales, UK
7.8km (4.8 miles) ⓘCwmystwyth Mine, Cwmystwyth, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
15.3km (9.5 miles) ⓘHafod Feddgar Mine, Llanidloes, Powys, Wales, UK
19.7km (12.2 miles) ⓘDylife Mine (Pen Dylife Mine; Esgairgaled Mine; Llechwedd Ddu Mine; Blaen Twymyn Mine), Dylife, Machynlleth, Powys, Wales, UK
54.4km (33.8 miles) ⓘDolyhir Quarry, Old Radnor, Powys, Wales, UK
76.9km (47.8 miles) ⓘBritannia Mine, Beddgelert, Gwynedd, Wales, UK
References
 
and/or  
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