Hurlbut, Cornelius S., Jr. Department of Geological Sciences, Harvard University, Cambridge, Massachusetts.
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A sorosilicate mineral of complex composition crystallizing in the tetragonal system; also known by the name idocrase. Crystals, frequently well formed, are usually prismatic with pyramidal terminations (see illustration). It commonly occurs in columnar aggregates but may be granular or massive. The luster is vitreous to resinous; the color is usually green or brown but may be yellow, blue, or red. Hardness is 6½ on Mohs scale; specific gravity is 3.35–3.45.
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