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
Elliott prospect (Elliot prospect), Caldwell Pines, East Mayacmas Mining District, Lake County, California, USA


Locality type:Prospect
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 Elliott prospect (Elliot prospect), Caldwell Pines, East Mayacmas Mining District, Lake County, California, USA
Data Identifiers
Mindat Occurrence Record ID:328017
Long-form Identifier:1:3:328017:1
GUID (UUID V4):0
Nearest other occurrences of Pyrolusite
26.2km (16.3 miles) ⓘBoyer Mine (Wheeler Mine; Shanks and Copps), Warm Springs Dam, Coast Range, Sonoma County, California, USA
26.4km (16.4 miles) ⓘShaw Mine, Shaw Ranch, Cloverdale, West Mayacmas Mining District, Sonoma County, California, USA
30.8km (19.1 miles) ⓘDow prospect, Clear Lake Oaks, Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District), Lake County, California, USA
32.9km (20.4 miles) ⓘCallizo prospect, Duncan Springs, Coastal Range, California, USA
34.7km (21.5 miles) ⓘPhillips Mine (Grand View Mine; White Rock Mine), Phillips Ranch, Laurel Dell, Lake County, California, USA
36.9km (22.9 miles) ⓘUnnamed Cu-Mn occurrence [1], Red Mountain, Red Mountain Mining District, Mendocino County, California, USA
39.6km (24.6 miles) ⓘMcLaughlin Mine (Manhattan Mine), Knoxville, Knoxville Mining District, Napa County, California, USA
41.9km (26.0 miles) ⓘRedington Mine (Boston Mine; Knoxville Mine; Excellsior Mine), Knoxville, Knoxville Mining District, Napa County, California, USA
49.2km (30.6 miles) ⓘVann Ranch prospect (Van Ranch Middle Creek; Black Rock; Grizzly Canyon prospect), Vann, Lake County, California, USA
56.1km (34.8 miles) ⓘRedwood Valley, Mendocino County, California, USA
References
Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 89-99
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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