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
Wheal Mary Ann, Menheniot, Cornwall, England, UK


03910220017272739729809.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
07611740017271985873930.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
00496960017271985902863.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
03611250017271985922020.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
04635150017367003531833.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
01981390017367003542611.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
08379190017868764707664.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
00718680017367003558541.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
03910220017272739729809.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
04793250017271985946938.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
00496960017271985902863.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
03611250017271985922020.jpg
Chalcedony

Wheal Mary Ann, Menheniot, Cornwall, England, UK
Locality type:Mine
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Quartz8
Fluorite5
Gypsum1
Galena1
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Wheal Mary Ann, Menheniot, Cornwall, England, UK
Photo GalleryView Gallery (18 photos)
Data Identifiers
Mindat Occurrence Record ID:3352
Long-form Identifier:1:3:3352:7
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
0.1km (0.1 miles) ⓘWheal Trelawny (incl. Wheal Honey), Menheniot, Cornwall, England, UK
0.6km (0.4 miles) ⓘWheal Trehane, Menheniot, Cornwall, England, UK
1.2km (0.8 miles) ⓘWest Wheal Mary Ann (West Mary Ann Mine), Roseland, Menheniot, Cornwall, England, UK
14.0km (8.7 miles) ⓘNorth Hooe Mine, Tamar Consols (Tamar Mines), Bere Alston Mines, Bere Ferrers, West Devon, Devon, England, UK
15.8km (9.8 miles) ⓘGunnislake Clitters Mine, Clitters United Mines, Gunnislake, Calstock, Cornwall, England, UK
19.0km (11.8 miles) ⓘRestormel Royal Iron Mine (Trinity Mine), Lostwithiel, Cornwall, England, UK
20.3km (12.6 miles) ⓘWheal Maudlin (Wheal Mawdlin; Wheal Magdalen), Lostwithiel, Cornwall, England, UK
21.6km (13.4 miles) ⓘWalkham and Poldice Mine (Wheal Walkham), Buckland Monachorum, West Devon, Devon, England, UK
28.3km (17.6 miles) ⓘNorth Mine (East Wheal Friendship), Devon United Mines, Peter Tavy, West Devon, Devon, England, UK
50.3km (31.2 miles) ⓘHaytor Mine, Ilsington, Teignbridge, Devon, England, UK
References
(1973) To the Editor. The Mineralogical Record, 4 (2) 91-95pp.95-95
 
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