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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Millerite from
Esgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK


00063460017368515715466.jpg
Millerite

Esgair Hir & Esgair Fraith mines, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
00063460017368515715466.jpg
Millerite

Esgair Hir & Esgair Fraith mines, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
05600770017272036243701.jpg
Millerite

Esgair Hir & Esgair Fraith mines, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
Locality type:Mine
Classification
Species:Millerite
Formula:NiS
Comments:Xls to 3mm embedded in sulphides
Habit:Prismatic
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Rare
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Confirmation Details:Where Tested and Reference ID: NHM London
Data
Mineral Data:Click here to view Millerite data
Locality Data:Click here to view Esgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
Data Identifiers
Mindat Occurrence Record ID:16927
Long-form Identifier:1:3:16927:9
GUID (UUID V4):0
Nearest other occurrences of Millerite
2.1km (1.3 miles) ⓘEaglebrook Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
3.0km (1.9 miles) ⓘHenfwlch Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
3.7km (2.3 miles) ⓘBryn-yr-Afr Mine, Ponterwyd, Trefeirig, Ceredigion, Wales, UK
4.3km (2.7 miles) ⓘCamdwrmawr Mine, Ponterwyd, Trefeirig, Ceredigion, Wales, UK
5.1km (3.2 miles) ⓘHyddgen Mine, Carn Hyddgen, Uwch y Garreg, Powys, Wales, UK
6.9km (4.3 miles) ⓘBrynarian Mine (Cardigan Bay Consols Mine), Tre-Taliesin, Llangynfelyn, Ceredigion, Wales, UK
7.6km (4.7 miles) ⓘErglodd mine (Eurglawdd Mine), Tre-Taliesin, Llangynfelyn, Ceredigion, Wales, UK
19.1km (11.9 miles) ⓘGwaithgoch Mine, Pontrhydygroes, Upper Llanfihangell-y-Creuddyn, Ceredigion, Wales, UK
64.9km (40.3 miles) ⓘDrws-y-Coed Mine (Drwy-y-Coed Mine), Nantlle Vale, Llanllyfni, Gwynedd, Wales, UK
80.5km (50.0 miles) ⓘNant Helen opencast coal mine, Onllwyn, Neath Port Talbot, Wales, UK
References
Rust, S. A., Mason, J. S. (1988) The Minerals of Esgair Hir Mine, Bwlch-y-Esgair Hir, Ceulanymaesmawr, Dyfed, Wales . UK Journal of Mines and Minerals 5, 35-43
 
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