Samfowlerite
Samfowlerite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₁₄Mn²⁺₃Zn₂Be₂Be₆Si₁₄O₅₂(OH)₆.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 3; specific gravity 3.28; White streak; Vitreous luster; optically biaxial.
IMA symbol Sfw, IMA status: approved, named in 1991.
Found in vugs in granular willemite-franklinite-andradite ore from a metamorphosed stratiform Zn{Mn deposit.
It is found associated with Andradite-grossular, cahnite, clinochlore, leucophoenicite, johnbaumite, barite, franklinite, willemite.
The name refers to Samuel Fowler, M.D. (1779–1844), who early encouraged study of the Franklin deposits.
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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