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 Gerry (Higher Rosewarne Mine; incl. Wheal Chance), South Roskear group (Pendarves Consols), Camborne, 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 Gerry (Higher Rosewarne Mine; incl. Wheal Chance), South Roskear group (Pendarves Consols), Camborne, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:906210
Long-form Identifier:1:3:906210:8
GUID (UUID V4):0
Nearest other occurrences of Opal
0.7km (0.4 miles) ⓘNorth Roskear Mine, North Roskear, Camborne, Cornwall, England, UK
2.6km (1.6 miles) ⓘWheal Gine (Wheal Polgine), Grenville United Mines, Troon, Camborne, Cornwall, England, UK
4.5km (2.8 miles) ⓘSouth Wheal Basset, Carnkie, Carn Brea, Cornwall, England, UK
5.1km (3.2 miles) ⓘWheal Buller, Wheal Buller and Beauchamp, Redruth, Cornwall, England, UK
5.3km (3.3 miles) ⓘRosewarne Consols, Halancoose, Gwinear-Gwithian, Cornwall, England, UK
5.3km (3.3 miles) ⓘNew Rosewarne Mine, Rosewarne United Mines, Gwinear-Gwithian, Cornwall, England, UK
6.3km (3.9 miles) ⓘRosewarne Mine (incl. Bowling Green Mine; Wheal Royal), Rosewarne and Herland United Mines (Rosewarne and Herland Mine; incl. Wheal Fancy; Wheal Pleasure), Copperhouse, Hayle, Cornwall, England, UK
6.7km (4.2 miles) ⓘCathedral Mine, Busveal, St Day, Cornwall, England, UK
7.3km (4.5 miles) ⓘTreskerby and Chance United Mine (incl. Treskerby Mine; Wheal Chance), Redruth, Cornwall, England, UK
7.4km (4.6 miles) ⓘWest Wheal Damsel (Wheal Spinster), Wheal Damsel United Mines, Carharrack, Cornwall, England, UK
References
Phillips, William (1823) An Elementary Introduction to Mineralogy (3rd ed.)
 
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