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
Rock Hill China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK


Locality type:Pit
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 Rock Hill China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:8253
Long-form Identifier:1:3:8253:2
GUID (UUID V4):0
Nearest other occurrences of Opal
0.4km (0.2 miles) ⓘGoonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK
1.0km (0.6 miles) ⓘGunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
1.2km (0.8 miles) ⓘGreat Wheal Prosper China Clay Pit, Trezaise (Tresayes), Roche, Cornwall, England, UK
2.7km (1.7 miles) ⓘGreat Longstone China Clay Pit, Longstone Downs, St Mewan, Cornwall, England, UK
3.4km (2.1 miles) ⓘCarclaze Old Tin Pit, Carclaze China Clay Pit (Baal China Clay Pit), Carludon, Treverbyn, Cornwall, England, UK
4.9km (3.0 miles) ⓘBlackpool China Clay Pit, Trewoon, St Mewan, Cornwall, England, UK
5.4km (3.4 miles) ⓘStenna Gwyn Mine (Stennagwyn Mine), Foxhole, St Stephen-in-Brannel, Cornwall, England, UK
5.5km (3.4 miles) ⓘLady Rashleigh Consols, Prideaux, Luxulyan (Luxullian), Cornwall, England, UK
5.7km (3.5 miles) ⓘGreat Wheal Prosper China Stone Quarry, Hendra Downs, St Dennis, Cornwall, England, UK
6.0km (3.8 miles) ⓘRostowrack China Clay Pit, Hendra Downs, St Dennis, Cornwall, England, UK
References
 
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