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The ratio of the three crystallographic axes which determines the position of any plane; also, the fundamental axial ratio for a given species.

A crystalline substance closely related to xanthin, present in small quantity in urine.

saponin, found in the root of sarsaparilla, smilax, etc., and extracted as a bitter white crystalline substance; -- called also smilacin, sarsaparilla saponin, and sarsaparillin.

Lamellar separation in a crystallized mineral, due to some other cause than cleavage, as to the presence of twinning lamellæ.

e form of small pearly grains. -- Pearl sinter (Min.), fiorite. -- Pearl spar (Min.), a crystallized variety of dolomite, having a pearly luster. -- Pearl white. (a) Basic bismuth nitrate, or bismuth subchloride; - - used chiefly as a cosmetic. (b) A variety of white lead blued with indigo or Berlin blue.…

Transparent and colorless rock crystal; as, Brazilian pebble; -- so called by opticians. Pebble powder, slow-burning gunpowder, in large cubical grains. -- Scotch pebble, varieties of quartz, as agate, chalcedony, etc., obtained from cavities in amygdaloid.

A whitish mineral occurring in radiated or fibrous crystalline masses. It is a hydrous silicate of lime and soda.

Transparent; clear; limpid; translucent; not opaque. "Pellucid crystal." Dr. H. More. "Pellucid streams." Wordsworth.

ng essentially of magnesia (magnesium oxide), occurring in granular forms or in isometric crystals.

A crystal of one species inclosing one of another species. See Endomorph.

A titanate of lime occurring in octahedral or cubic crystals. [Written also Perovskite.]

Pertaining to, or designating, a yellow crystalline substance (called also perthiocyanic acid), analogous to sulphocyanic acid, but containing more sulphur.

A rare mineral, occurring crystallized and in cleavable masses, usually white, or nearly so, in color. It is a silicate of aluminia and lithia.

A tasteless white crystalline substance, extracted from the roots of the sulphurwort (Peucedanum), masterwort (Imperatoria), and other related plants; -- called also imperatorin.

A hydrous arsenate of iron occurring in green or yellowish green cubic crystals; cube ore.

A white, crystalline compound, C10H13O2N, used in medicine principally as an antipyretic.

A glassy colorless mineral occurring in rhombohedral crystals, sometimes used as a gem. It is a silicate of glucina, and receives its name from its deceptive similarity to quartz.

A complex hydrocarbon, C14H10, found in coal tar, and obtained as a white crystalline substance with a bluish fluorescence.

One of the prominent embedded crystals of a porphyry.

A white or pinkish crystalline substance, C6H5OH, produced by the destructive distillation of many organic bodies, as wood, coal, etc., and obtained from the heavy oil from coal tar.