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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Pyrolusite from
Pencrebar Wood Mine (Pencrebar Mine; Creva Wood Mine), Callington, Cornwall, England, UK


Locality type:Mine
Classification
Species:Pyrolusite
Formula:Mn4+O2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Rhodonite1
Data
Mineral Data:Click here to view Pyrolusite data
Locality Data:Click here to view Pencrebar Wood Mine (Pencrebar Mine; Creva Wood Mine), Callington, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:9134
Long-form Identifier:1:3:9134:3
GUID (UUID V4):0
Nearest other occurrences of Pyrolusite
9.7km (6.0 miles) ⓘPhoenix United Mine, Minions, Linkinhorne, Cornwall, England, UK
9.9km (6.2 miles) ⓘTremollett mine (Coads Green), North Hill, Cornwall, England, UK
11.4km (7.1 miles) ⓘGreystone Wood Mine, Lezant, Cornwall, England, UK
12.6km (7.8 miles) ⓘGreystone Quarry, Lezant, Cornwall, England, UK
15.6km (9.7 miles) ⓘChillaton and Hogstor Mine, Milton Abbot, West Devon, Devon, England, UK
16.1km (10.0 miles) ⓘTreburland Manganese Mine (Treburland manganese deposits), Altarnun, Cornwall, England, UK
16.4km (10.2 miles) ⓘWeek Mine, Milton Abbot, West Devon, Devon, England, UK
18.2km (11.3 miles) ⓘWheal Truscott, St Stephens By Launceston Rural, Launceston, Cornwall, England, UK
20.1km (12.5 miles) ⓘLidcott Mine, Laneast, Cornwall, England, UK
21.4km (13.3 miles) ⓘBlack Down (Blackdown), Mary Tavy, West Devon, Devon, England, UK
References
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.
Russell, A. (1945): Mineralogical Magazine 27, 221-235
Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp.
 
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