Negative crystal

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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.
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References in periodicals archive ?
Sunderland were unable to overcome a negative Crystal Palace at the Stadium of Light last week, but Johnson believes home advantage will stop Norwich playing the same way.
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.