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  • A cruciform-twinned crystal of staurolite, used as a curio stone without fashioning for adornment. The term is also applied as a syn. of staurolite, and esp. to the variety occurring in the form of a twinned crystal. See also: staurolite b. Any of various odd or fantastically shaped calcareous or ferruginous concretions formed in alluvial clays. (Dictionary of Mining, Mineral, and Related Terms)

    June 9, 2011