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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Mottramite from
Penberthy Croft Mine, St Hilary, Cornwall, England, UK


02252870017362307436316.jpg
Mottramite, etc.

Penberthy Croft Mine, St Hilary, Cornwall, England, UK
02252870017362307436316.jpg
Mottramite, etc.

Penberthy Croft Mine, St Hilary, Cornwall, England, UK
05375650017362307438651.jpg
Mottramite, etc.

Penberthy Croft Mine, St Hilary, Cornwall, England, UK
Locality type:Mine
Classification
Species:Mottramite
Formula:PbCu(VO4)(OH)
Formation:Secondary
Comments:Kingsbury Collection at the NHM. Showed to be fraudulent. See http://www.mindat.org/mesg-104-355275.html
Proved to be Vanadian enriched Duftite.

A specimen submitted by David P. Clough to the NHM London in the 1980s was proven to be Mottramite
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Associated Minerals Based on Photo Data:
Mimetite1
Bayldonite1
Data
Mineral Data:Click here to view Mottramite data
Locality Data:Click here to view Penberthy Croft Mine, St Hilary, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:46840
Long-form Identifier:1:3:46840:8
GUID (UUID V4):0
Nearest other occurrences of Mottramite
27.6km (17.1 miles) ⓘDean Quarry, St Keverne, Cornwall, England, UK
93.9km (58.3 miles) ⓘGreystone Quarry, Lezant, Cornwall, England, UK
References
British Micromount Newletter No 19 March1987 Page 5
Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp.
 
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