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
Wheal Truscott, St Stephens By Launceston Rural, Launceston, Cornwall, England, UK


Locality type:Mine
Classification
Species:Pyrolusite
Formula:Mn4+O2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Pyrolusite data
Locality Data:Click here to view Wheal Truscott, St Stephens By Launceston Rural, Launceston, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:9127
Long-form Identifier:1:3:9127:5
GUID (UUID V4):0
Nearest other occurrences of Pyrolusite
6.3km (3.9 miles) ⓘLidcott Mine, Laneast, Cornwall, England, UK
7.8km (4.8 miles) ⓘGreystone Quarry, Lezant, Cornwall, England, UK
8.5km (5.3 miles) ⓘGreystone Wood Mine, Lezant, Cornwall, England, UK
9.1km (5.6 miles) ⓘTreburland Manganese Mine (Treburland manganese deposits), Altarnun, Cornwall, England, UK
10.0km (6.2 miles) ⓘTremollett mine (Coads Green), North Hill, Cornwall, England, UK
13.5km (8.4 miles) ⓘChillaton and Hogstor Mine, Milton Abbot, West Devon, Devon, England, UK
14.0km (8.7 miles) ⓘPhoenix United Mine, Minions, Linkinhorne, Cornwall, England, UK
15.4km (9.5 miles) ⓘWeek Mine, Milton Abbot, West Devon, Devon, England, UK
18.2km (11.3 miles) ⓘPencrebar Wood Mine (Pencrebar Mine; Creva Wood Mine), Callington, Cornwall, England, UK
21.0km (13.1 miles) ⓘBlack Down (Blackdown), Mary Tavy, West Devon, Devon, England, UK
References
Russell, Arthur (1946) On rhodonite and tephroite from Treburland manganese mine, Altarnun, Cornwall; and on rhodonite from other localities in Cornwall and Devonshire. Mineralogical Magazine and Journal of the Mineralogical Society, 27 (194) 221-235 doi:10.1180/minmag.1946.027.194.02
 
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