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A semipellucid, uncrystallized variety of quartz, presenting various tints in the same specimen. Its colors are delicately arranged in stripes or bands, or blended in clouds.

Conjecture; guess. [Obs.] What you would work me to, I have some aim. Shak. To cry aim (Archery), to encourage. [Obs.] Shak.

A white crystalline base, C3H7NO2, derived from aldehyde ammonia.

A white crystalline resinous substance extracted from gutta- percha by the action of alcohol or ether.

A mineral of the feldspar family, triclinic in crystallization, and in composition a silicate of alumina and soda. It is a common constituent of granite and of various igneous rocks. See Feldspar.

A crystallizable compound of a salt with alcohol, in which the latter plays a part analogous to that of water of crystallization. Graham.

A kind of seaweed; pl. the class of cellular cryptogamic plants which includes the black, red, and green seaweeds, as kelp, dulse, sea lettuce, also marine and fresh water confervæ, etc.

A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; -- formerly called allantoic acid and amniotic acid.

Variability in chemical constitution without variation in crystalline form.

Any one of two or more distinct crystalline forms of the same substance; or the substance having such forms; -- as, carbonate of lime occurs in the allomorphs calcite and aragonite.

With a loud voice, or great noise; loudly; audibly. Cry aloud, spare not, lift up thy voice. Isa. lviii. 1.

A crystalline derivative of salicylic acid, used as an antiseptic and antirheumatic.

element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization.

A characteristic crystalline substance, obtained from oil of bitter almonds.

A variety of crystallized quartz, of a purple or bluish violet color, of different shades. It is much used as a jeweler's stone. Oriental amethyst, the violet-blue variety of transparent crystallized corundum or sapphire.

A state of being amorphous; esp. a state of being without crystallization even in the minutest particles, as in glass, opal, etc.

Without crystallization in the ultimate texture of a solid substance; uncrystallized.

ral embracing many varieties varying in color and in composition. It occurs in monoclinic crystals; also massive, generally with fibrous or columnar structure. The color varies from white to gray, green, brown, and black. It is a silicate of magnesium and calcium, with usually aluminium and iron. Some common varieties…

A glucoside extracted from bitter almonds as a white, crystalline substance.

A white or flesh-red mineral, of the zeolite, occurring in isometric crystals. By friction, it acquires a weak electricity; hence its name.