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Birnessite from
Kramer Borate deposit, Boron, Kramer District (Kramer Borate District), Kern Co., California, USA

Mineral Species
Species:Birnessite
Formula:(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
Description
Comments:Occurs as specks on colemanite.
Colour:Blackish to brown
Quality for species:not specified / average specimens
Confirmation
Validity:Believed Valid
References
References:Morgan, V. and Erd, R.C. (1969) Minerals of the Kramer borate district, California California Division of Mines and Geology Mineral Information Service: 22(9): 168; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 168 (photo 4-5).
Associated Minerals:
Associates:Colemanite
Data
Mineral Data:Click here to view Birnessite data
Locality Data:Click here to view Kramer Borate deposit, Boron, Kramer District (Kramer Borate District), Kern Co., California, USA
Nearest other occurrences of Birnessite
5.8km (3.6 miles) A Boron, Kramer District (Kramer Borate District), Kern Co., California, USA
Mineral and/or Locality  
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