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Member of the inosilicates with composition (Mn,Ca)Si2O6 and related to the pyroxenes but with a different atomic structure, and termed a pyroxenoid (see also wollastonite); sp. gr. 3.57–3.76; hardness 5.5–6.0; pink to brownish-red; tabular or massive; occurs in manganese-rich mineral deposits, e.g. in Franklin, New Jersey.

Subjects: Earth Sciences and Geography.

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