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A white crystalline, sugary substance obtained from an African caotchouc.

A crystalline vari ety of fruit sugar obtained from dambonite.

A mineral occuring in octahedral crystals, also massive, of a reddish color. It is a silicate of iron, zinc manganese, and glicinum, containing sulphur.

A colorless crystalline substance, C9H6O4, extracted from daphnin.

A white, crystalline, bitter substance, regarded as a glucoside, and extracted from Daphne mezereum and D. alpina.

A white crystalline glucoside extracted from the bastard hemp (Datisca cannabina).

A borosilicate of lime commonly occuring in glassy,, greenish crystals. [Written also datholite.]

absorbing moisture from the air, as certain salts, acids, and alkalies. In very moist air crystals of strontites deliquesce. Black.

oduced by a foreign mineral, usually an oxide of manganese, as in the moss agate; also, a crystallized mineral having an arborescent form, e. g., gold or silver; an arborization.

Pertaining to a dendrite, or to arborescent crystallization; having a form resembling a shrub or tree; arborescent.

arization of light (Opt.), a change in the plane of polarization of rays, especially by a crystalline medium, such that the light which had been extinguished by the analyzer reappears as if the polarization had been anulled. The word is inappropriate, as the ray does not return to the unpolarized condition.…

Same as Stilbite. It commonly occurs in bundles or tufts of crystals.

molten glassy matter into a stony mass by slow cooling, the result being the formation of crystallites, microbites, etc., in the glassy base, which are then called devitrification products.

ning the plane of polarization of luminous rays toward the right hand; as, dextrorotatory crystals, sugars, etc. Cf. Levorotatory.

A sirupy, or white crystalline, variety of sugar, C6H12O6 (so called from turning the plane of polarization to the right), occurring in many ripe fruits. Dextrose and levulose are obtained by the inversion of cane sugar or sucrose, and hence called invert sugar. Dextrose is chiefly obtained by the action of heat and ac…

A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone.

The separation of different substances in solution, as crystalloids and colloids, by means of their unequal diffusion, especially through natural or artificial membranes.

ch bisects a system of parallel chords drawn in a curve or surface. -- Diametral planes (Crystal.), planes in which two of the axes lie.

Having a single, distinct, diagonal cleavage; -- said of crystals. Mohs.

Having the property of dichroism; as, a dichroic crystal.