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ATHENA

MINERALOGY

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Mineral: CUMMINGTONITE
Formula: ▢Mg7Si8O22(OH)2
Crystal System: Monoclinic
Group: Amphibole supergroup, with (OH,F,Cl) dominant. Mg-Fe-Mn subgroup. Anthophyllite group
IMA Number: 2012 s.p.
References: AM 74 (1989), 1091; HB2/1 (1995); MM 61 (1997), 295; Phys. Chem. Min. 28 (2001), 87
Type Locality: Cummington, Hampshire Co., Massachusetts, USA
Comments: ▢ = vacancy

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