	A cavity in a mineral mass, having the form of a crystal.
	A crystal which has the power of negative double refraction. See refraction.

See also: Negative, Negative

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.

Mentioned in

Positive crystals

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They usually show a constant ratio between the liquid water and the carbonic fluids and they are characterized by quite regular negative crystal shapes even if sometimes irregular morphologies have been observed.

The Main Central Thrust Zone in Western Nepal

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Negative crystal