Formula :
(Mg,Fe2+)74O1]2
System: monoclinic Hardness:5-6 Rarity:not common
Strunz id:VIII/F.7-20 -
SILICATES
Name origin: Cummingtonite was originally named in 1824 by Chester Dewey for the type locality in Cummington, Massachusetts, USA. Dewey (1824)
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