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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Opal from
Wheal Buller, Wheal Buller and Beauchamp, Redruth, Cornwall, England, UK


Locality type:Mine
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Wheal Buller, Wheal Buller and Beauchamp, Redruth, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:8251
Long-form Identifier:1:3:8251:8
GUID (UUID V4):0
Nearest other occurrences of Opal
0.8km (0.5 miles) ⓘSouth Wheal Basset, Carnkie, Carn Brea, Cornwall, England, UK
2.2km (1.4 miles) ⓘCathedral Mine, Busveal, St Day, Cornwall, England, UK
2.7km (1.7 miles) ⓘWest Wheal Damsel (Wheal Spinster), Wheal Damsel United Mines, Carharrack, Cornwall, England, UK
3.2km (2.0 miles) ⓘWheal Damsel, Wheal Damsel United Mines, Carharrack, Cornwall, England, UK
4.0km (2.5 miles) ⓘWheal Gine (Wheal Polgine), Grenville United Mines, Troon, Camborne, Cornwall, England, UK
4.1km (2.5 miles) ⓘWheal Gorland, St Day, Cornwall, England, UK
4.1km (2.5 miles) ⓘTreskerby and Chance United Mine (incl. Treskerby Mine; Wheal Chance), Redruth, Cornwall, England, UK
4.9km (3.0 miles) ⓘNorth Roskear Mine, North Roskear, Camborne, Cornwall, England, UK
5.1km (3.2 miles) ⓘWheal Gerry (Higher Rosewarne Mine; incl. Wheal Chance), South Roskear group (Pendarves Consols), Camborne, Cornwall, England, UK
8.7km (5.4 miles) ⓘRosewarne Consols, Halancoose, Gwinear-Gwithian, Cornwall, England, UK
References
Hall, Townshend M. (1868) The Mineralogist's Directory: or, a guide to the Principal Mineral Localities in the United Kingdom of Great Britain and Ireland. Edward Stanford.
Collins, J. H. (1871) A Handbook to the Mineralogy of Cornwall and Devon. Heard and Sons, Truro.
 
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