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Pyrolusite from
Vann Ranch prospect (Van Ranch Middle Creek; Black Rock; Grizzly Canyon prospect), Vann, Lake Co., California, USA

Description
Quality of samples:	not specified / average specimens
Confirmation
Validity:	Believed Valid
References
References:	Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 98; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 164.
Data
Mineral Data:	Click here to view Pyrolusite data
Locality Data:	Click here to view Vann Ranch prospect (Van Ranch Middle Creek; Black Rock; Grizzly Canyon prospect), Vann, Lake Co., California, USA

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