cummingtonite Definition
a brown or black mineral of the amphibole group, consisting of a double silicate of magnesium, iron, and sodium.
Origins of cummingtonite
named after Cummington, Massachusetts, where it was first found
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Summary: cummingtonite in Brief
The term 'cummingtonite' [ˈkʌmɪŋtənaɪt] refers to a brown or black mineral of the amphibole group, composed of a double silicate of magnesium, iron, and sodium. It was named after Cummington, Massachusetts, where it was first discovered.
