chloritoid

noun chlo·ri·toid \ -rəˌtȯid \

Definition of chloritoid

plural -s
:a mineral (Mg1Fe)AlSiAlO5(OH)2 consisting of a silicate of aluminum and ferrous iron with magnesium occurring usually in dull green to gray or grayish black masses of brittle folia and related to the brittle micas (as clintonite)

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Origin and Etymology of chloritoid

German, from chlorit chlorite (mineral) + -oid


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