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
Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK


07503340017362415702597.jpg
Opal, etc.

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
06814400017271980311170.jpg
Opal, etc.

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
08176040017271980347929.jpg
Opal

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
09328570017271980375951.jpg
Opal

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
07503340017362415702597.jpg
Opal, etc.

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
07377840017363355509481.jpg
Opal, etc.

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
08176040017271980347929.jpg
Opal

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
09576170017363355502624.jpg
Opal

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
02803270017362415716498.jpg
Opal, etc.

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
06814400017271980311170.jpg
Opal, etc.

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
08176040017271980347929.jpg
Opal

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
09328570017271980375951.jpg
Opal

Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
Locality type:Pit
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Turquoise5
- var Rashleighite5
Cuprite2
Malachite2
Azurite1
Metatorbernite1
Tourmaline1
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
Photo GalleryView Gallery (15 photos)
Data Identifiers
Mindat Occurrence Record ID:8262
Long-form Identifier:1:3:8262:4
GUID (UUID V4):0
Nearest other occurrences of Opal
1.0km (0.6 miles) ⓘRock Hill China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK
1.1km (0.7 miles) ⓘGoonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK
1.5km (0.9 miles) ⓘGreat Wheal Prosper China Clay Pit, Trezaise (Tresayes), Roche, Cornwall, England, UK
1.8km (1.1 miles) ⓘGreat Longstone China Clay Pit, Longstone Downs, St Mewan, Cornwall, England, UK
3.0km (1.9 miles) ⓘCarclaze Old Tin Pit, Carclaze China Clay Pit (Baal China Clay Pit), Carludon, Treverbyn, Cornwall, England, UK
3.9km (2.4 miles) ⓘBlackpool China Clay Pit, Trewoon, St Mewan, Cornwall, England, UK
4.6km (2.8 miles) ⓘStenna Gwyn Mine (Stennagwyn Mine), Foxhole, St Stephen-in-Brannel, Cornwall, England, UK
4.9km (3.1 miles) ⓘGreat Wheal Prosper China Stone Quarry, Hendra Downs, St Dennis, Cornwall, England, UK
5.3km (3.3 miles) ⓘRostowrack China Clay Pit, Hendra Downs, St Dennis, Cornwall, England, UK
5.9km (3.7 miles) ⓘLady Rashleigh Consols, Prideaux, Luxulyan (Luxullian), Cornwall, England, UK
References
Barstow, R. W. (1982) Variscite from Hensbarrow china clay works, St. Austell, Cornwall. Mineralogical Magazine, 46 (341) 512 doi:10.1180/minmag.1982.046.341.23
Tindle, Andy G. (2008) Minerals of Britain and Ireland. Terra Publishing.
 
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