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ATHENA

MINERALOGY

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Mineral: GRUNERITE
Formula: ▢Fe2+7Si8O22(OH)2
Crystal System: Monoclinic
Group: Amphibole supergroup, with (OH,F,Cl) dominant. Mg-Fe-Mn subgr. Gedrite group
IMA Number: 2012 s.p.
References: HB2/1 (1995); Physics and Chemistry of Minerals 46 (2019), 215
Type Locality: Collobrières, Var, France
Comments: ▢ = vacancy

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