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
Rosewarne Consols, Halancoose, Gwinear-Gwithian, 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 Rosewarne Consols, Halancoose, Gwinear-Gwithian, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:8244
Long-form Identifier:1:3:8244:0
GUID (UUID V4):0
Nearest other occurrences of Opal
1.0km (0.6 miles) ⓘNew Rosewarne Mine, Rosewarne United Mines, Gwinear-Gwithian, Cornwall, England, UK
2.6km (1.6 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
4.5km (2.8 miles) ⓘWheal Alfred, Great Wheal Alfred (Alfred Consols), Hayle, Cornwall, England, UK
4.8km (3.0 miles) ⓘWheal Gine (Wheal Polgine), Grenville United Mines, Troon, Camborne, Cornwall, England, UK
5.3km (3.3 miles) ⓘWheal Gerry (Higher Rosewarne Mine; incl. Wheal Chance), South Roskear group (Pendarves Consols), Camborne, Cornwall, England, UK
6.0km (3.7 miles) ⓘNorth Roskear Mine, North Roskear, Camborne, Cornwall, England, UK
7.9km (4.9 miles) ⓘSouth Wheal Basset, Carnkie, Carn Brea, Cornwall, England, UK
8.7km (5.4 miles) ⓘWheal Buller, Wheal Buller and Beauchamp, Redruth, Cornwall, England, UK
10.9km (6.7 miles) ⓘCathedral Mine, Busveal, St Day, Cornwall, England, UK
11.5km (7.1 miles) ⓘWest Wheal Damsel (Wheal Spinster), Wheal Damsel United Mines, Carharrack, Cornwall, England, UK
References
Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp.
 
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