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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Bertrandite from
Trolvis Quarry, Longdowns, Stithians, Cornwall, England, UK


Locality type:Quarry
Classification
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view Trolvis Quarry, Longdowns, Stithians, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:1874
Long-form Identifier:1:3:1874:6
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
0.6km (0.4 miles) ⓘChywoon Quarry, Mabe, Cornwall, England, UK
0.9km (0.5 miles) ⓘHalvosso Quarry (Halvasso Quarry; Kessel Downs Quarry), Mabe, Cornwall, England, UK
3.5km (2.2 miles) ⓘMaen Quarry, Constantine, Cornwall, England, UK
9.4km (5.9 miles) ⓘGreat Condurrow Mine, Beacon, Camborne, Cornwall, England, UK
10.1km (6.3 miles) ⓘSouth Crofty Mine, Pool, Carn Brea, Cornwall, England, UK
12.9km (8.0 miles) ⓘWheal Metal, Carnmeal Downs, Breage, Cornwall, England, UK
26.1km (16.2 miles) ⓘSouth Terras Mine (Resugga & Tolgarrick Mine; Union Mine; Uranium Mine), St Stephen-in-Brannel, Cornwall, England, UK
63.1km (39.2 miles) ⓘGold-diggings Quarry (Swit Quarry), Craddock Moor, St Cleer, Cornwall, England, UK
63.8km (39.7 miles) ⓘCheesewring Quarry, Minions, Linkinhorne, Cornwall, England, UK
74.1km (46.1 miles) ⓘEast Kit Hill Mine, Kit Hill United Mines (incl. Kit Hill Great Consols), Callington, Stokeclimsland, Cornwall, England, UK
References
Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp.
 
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