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
Callizo prospect, Duncan Springs, Coastal Range, California, USA


Locality type:Prospect
Classification
Species:Pyrolusite
Formula:Mn4+O2
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Psilomelane
Data
Mineral Data:Click here to view Pyrolusite data
Locality Data:Click here to view Callizo prospect, Duncan Springs, Coastal Range, California, USA
Data Identifiers
Mindat Occurrence Record ID:673256
Long-form Identifier:1:3:673256:1
GUID (UUID V4):0
Nearest other occurrences of Pyrolusite
11.1km (6.9 miles) ⓘShaw Mine, Shaw Ranch, Cloverdale, West Mayacmas Mining District, Sonoma County, California, USA
25.9km (16.1 miles) ⓘUnnamed Cu-Mn occurrence [1], Red Mountain, Red Mountain Mining District, Mendocino County, California, USA
28.6km (17.8 miles) ⓘPhillips Mine (Grand View Mine; White Rock Mine), Phillips Ranch, Laurel Dell, Lake County, California, USA
32.9km (20.4 miles) ⓘElliott prospect (Elliot prospect), Caldwell Pines, East Mayacmas Mining District, Lake County, California, USA
33.5km (20.8 miles) ⓘBoyer Mine (Wheeler Mine; Shanks and Copps), Warm Springs Dam, Coast Range, Sonoma County, California, USA
36.0km (22.3 miles) ⓘRedwood Valley, Mendocino County, California, USA
42.3km (26.3 miles) ⓘVann Ranch prospect (Van Ranch Middle Creek; Black Rock; Grizzly Canyon prospect), Vann, Lake County, California, USA
43.3km (26.9 miles) ⓘWild Devil Mine (Waldteufel; Waldteufel Mine), Potter Valley area, Coastal Range, California, USA
45.4km (28.2 miles) ⓘBevins-Busch Mine (Bevins-Busch deposit; Lee Mine; Potter Valley Mine), Potter Valley area, Coastal Range, California, USA
50.7km (31.5 miles) ⓘDow prospect, Clear Lake Oaks, Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District), Lake County, California, USA
References
Bradley, W.W., et al (1918), Manganese and chromium in California: California Mining Bureau. Bulletin 76: 39-49
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 304.
 
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