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Spinelle. o £ The cryftals are fmall and very fmall, very rarely middle fized, and probably all around cryftal- lized. Planes generally fmooth. Externally and internally its luftre is fplendent and Vitreous. Frafture nearly perfectly flat conchoidal, and fome- times imperfectly foliated. Fragments indeterminately angular, lharp edged. It alternates from tranflucent to tranfparent. Hard in a high degree, but can be fcratched by Fapphire. Not particularly heavy, approaching to heavy. Specific gravity—3,700,645. Rluproth. Chemical Charafiers.- Before the blow pipe it is unalterable without addi tion, but is fufible with borax. M Constituent