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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Chalcedony from
Trevascus Mine (Trevaskus Mine; Trevaskis Mine), Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK


09578040017272728308542.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
06617530017271996816681.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
06787170017271966503649.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
06055930017271996825983.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
09578040017272728308542.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
06617530017271996816681.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
06787170017271966503649.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
06055930017271996825983.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
09578040017272728308542.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
07196160017271996869948.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
02904980017271966513258.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
07823340017271996875855.jpg
Chalcedony

Trevascus Mine, Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
Locality type:Mine
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Trevascus Mine (Trevaskus Mine; Trevaskis Mine), Carnhell Green, Gwinear-Gwithian, Cornwall, England, UK
Photo GalleryView Gallery (14 photos)
Data Identifiers
Mindat Occurrence Record ID:3356
Long-form Identifier:1:3:3356:5
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
1.3km (0.8 miles) ⓘNew Rosewarne Mine, Rosewarne United Mines, Gwinear-Gwithian, Cornwall, England, UK
1.6km (1.0 miles) ⓘRelistian Mine (Relistien Mine; Relistian Consols), Reawla, Gwinear-Gwithian, Cornwall, England, UK
2.8km (1.8 miles) ⓘAlfred Consols (East Wheal Alfred; Laity Hills Mine), Great Wheal Alfred (Alfred Consols), Hayle, Cornwall, England, UK
3.4km (2.1 miles) ⓘWheal Alfred, Great Wheal Alfred (Alfred Consols), Hayle, Cornwall, England, UK
5.5km (3.4 miles) ⓘNorth Roskear, Camborne, Cornwall, England, UK
5.7km (3.5 miles) ⓘGodolphin Mine (Godolphin Bal), Godolphin Cross, Breage, Cornwall, England, UK
6.1km (3.8 miles) ⓘPolcrebo Downs Mine, Nancegollan, Crowan, Cornwall, England, UK
6.1km (3.8 miles) ⓘSouth Crofty Mine, Pool, Carn Brea, Cornwall, England, UK
7.1km (4.4 miles) ⓘEast Pool Mine, Pool, Carn Brea, Cornwall, England, UK
7.2km (4.5 miles) ⓘCarn Brea Mine, Pool, Carn Brea, Cornwall, England, UK
References
Phillips, William (1823) An Elementary Introduction to Mineralogy (3rd ed.)
Hogg, Thomas (1825) A Manual of Mineralogy - In which is shown how much Cornwall contributes to the illustration of the science. W. Polybank High Cross, Truro.
Henwood, William Jory (1843) On the Metalliferous Deposits of Cornwall and Devon. Transactions of the Royal Geological Society of Cornwall, 5. 1-386
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.
 
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