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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Acanthite from
Greystone Quarry, Lezant, Cornwall, England, UK


Locality type:Quarry
Classification
Species:Acanthite
Formula:Ag2S
Comments:Identified as minute black crystals and crusts on native solve on a single specimen and considered to be post-mining in origin.

Ref: Famous British Mineral Localities: Greystone Quarry, Lezant, Cornwall. N Elton, D Green, J Hooper & S Weiss. UK Journal of Mines & Minerals No 24 2004, pp 9-28
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Acanthite data
Locality Data:Click here to view Greystone Quarry, Lezant, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:22
Long-form Identifier:1:3:22:2
GUID (UUID V4):0
Nearest other occurrences of Acanthite
11.0km (6.8 miles) ⓘWheal Brothers (Wheal Duchy), East Cornwall Silver Mines (St Vincent Great Consols; incl. Wheal Emily; Wheal Georgiana; Wheal Mercer), Wheal Langford (New Wheal Langford; Baring and Langford Mine), Calstock, Cornwall, England, UK
11.1km (6.9 miles) ⓘWheal St Vincent (East Cornwall St Vincent Mine; Wheal David), East Cornwall Silver Mines (St Vincent Great Consols; incl. Wheal Emily; Wheal Georgiana; Wheal Mercer), Wheal Langford (New Wheal Langford; Baring and Langford Mine), Calstock, Cornwall, England, UK
11.2km (6.9 miles) ⓘWheal Fortune (Wheal Newton and Queen; South Harrowbarrow Mine; incl. Wheal Newton (Wheal Barnard); Wheal Queen), Harrowbarrow Mine (Harrowbeer Mine; Wheal Goodluck; East Wheal Brothers), Harrowbarrow & Prince of Wales Mines (Calstock United Tin and Copper Mines), Calstock, Cornwall, England, UK
11.2km (7.0 miles) ⓘWheal Langford (New Wheal Langford; Baring and Langford Mine), Calstock, Cornwall, England, UK
11.5km (7.2 miles) ⓘDarley Ford Quarry, Darley, Linkinhorne, Cornwall, England, UK
13.3km (8.3 miles) ⓘNew Trelawny Mine (Gang Mine), Gang, St Ive, Cornwall, England, UK
15.5km (9.6 miles) ⓘWheal Wrey, Wrey and Ludcott United Mines, St Ive, Cornwall, England, UK
15.9km (9.9 miles) ⓘWheal Ludcott, Wrey and Ludcott United Mines, St Ive, Cornwall, England, UK
16.3km (10.1 miles) ⓘWheal Jewell, Mary Tavy, West Devon, Devon, England, UK
42.8km (26.6 miles) ⓘPolmear Cliff, Carlyon, Cornwall, England, UK
References
Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp.
 
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