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
Gold-diggings Quarry (Swit Quarry), Craddock Moor, St Cleer, 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 Gold-diggings Quarry (Swit Quarry), Craddock Moor, St Cleer, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:1870
Long-form Identifier:1:3:1870:8
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
0.9km (0.5 miles) ⓘCheesewring Quarry, Minions, Linkinhorne, Cornwall, England, UK
13.9km (8.7 miles) ⓘEast Kit Hill Mine, Kit Hill United Mines (incl. Kit Hill Great Consols), Callington, Stokeclimsland, Cornwall, England, UK
16.0km (9.9 miles) ⓘHingston Down Quarry, Gunnislake, Calstock, Cornwall, England, UK
37.2km (23.1 miles) ⓘSouth Terras Mine (Resugga & Tolgarrick Mine; Union Mine; Uranium Mine), St Stephen-in-Brannel, Cornwall, England, UK
62.6km (38.9 miles) ⓘChywoon Quarry, Mabe, Cornwall, England, UK
63.1km (39.2 miles) ⓘTrolvis Quarry, Longdowns, Stithians, Cornwall, England, UK
63.9km (39.7 miles) ⓘHalvosso Quarry (Halvasso Quarry; Kessel Downs Quarry), Mabe, Cornwall, England, UK
66.0km (41.0 miles) ⓘMaen Quarry, Constantine, Cornwall, England, UK
66.2km (41.1 miles) ⓘSouth Crofty Mine, Pool, Carn Brea, Cornwall, England, UK
67.4km (41.9 miles) ⓘGreat Condurrow Mine, Beacon, Camborne, Cornwall, England, UK
References
Bowman, H. L. (1911) On the occurrence of Bertrandite at the Cheesewring Quarry, near Liskeard, Cornwall. Mineralogical Magazine and Journal of the Mineralogical Society, 16 (73) 47-50 doi:10.1180/minmag.1911.016.073.06
Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp.
 
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