Bostwickite
Bostwickite is an IMA-recognized mineral species in the silicate class, with the chemical formula CaMn³⁺₆Si₃O₁₆·7H₂O.
Key properties: Mohs hardness 1; specific gravity 2.93; Brownish red streak; Vitreous to submetallic on prism surfaces luster; optically biaxial.
IMA symbol Btw, IMA status: approved, named in 1982.
Found in a metamorphosed stratiform zinc deposit, on surfaces of ore and on secondary carbonate minerals.
It is found associated with Franklinite, calcite, fluorite, willemite, kittatinnyite.
The name refers to Richard C. Bostwick, collector of Franklin minerals and expert in mineral fluorescence.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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