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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Francevillite from
South Terras Mine (Resugga & Tolgarrick Mine; Union Mine; Uranium Mine), St Stephen-in-Brannel, Cornwall, England, UK


Locality type:Mine
Classification
Species:Francevillite
Formula:Ba(UO2)2(VO4)2 · 5H2O
Comments:Fourth Supplementary List of British Minerals
Peter G. Embrey

** Francevillite Orthorhombic
Ba(UO2)2(VO4)2.5H20
Yellow earthy crust on pitchblende nodule, at
South Terras mine, St. Stephen-in-Brannell, Cornwall. BM(NH)specimen, from V. P. Aspland (1936).
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Francevillite data
Locality Data:Click here to view South Terras Mine (Resugga & Tolgarrick Mine; Union Mine; Uranium Mine), St Stephen-in-Brannel, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:5378
Long-form Identifier:1:3:5378:5
GUID (UUID V4):0
References
Embrey, Peter G. (1978) Fourth supplementary list of British minerals. Mineralogical Magazine, 42 (322) 169-177 doi:10.1180/minmag.1978.042.322.01
Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp.
 
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