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A plane of an orthorhombic crystal which is parallel both to the vertical axis and to the shorter lateral (brachydiagonal) axis.

A substance, C16H14O5, extracted from brazilwood as a yellow crystalline powder which is white when pure. It is colored intensely red by alkalies on exposure to the air, being oxidized to bra*sil"e*in, C16H12O5, to which brazilwood owes its dyeing properties.

nce contained in both Brazil wood and Sapan wood, from which it is extracted as a yellow crystalline substance which is white when pure. It is colored intensely red by alkalies. [Written also brezilin.]

A rare zeolitic mineral occurring in white monoclinic crystals with pearly luster. It is a hydrous silicate of aluminia, baryta, and strontia.

ed for polishing cultery; -- originally manufactured at Bristol. -- Bristol stone, rock crystal, or brilliant crystals of quartz, found in the mountain limestone near Bristol, and used in making ornaments, vases, etc. When polished, it is called Bristol diamond.

break; fragile; not tough or tenacious. Farewell, thou pretty, brittle piece Of fine-cut crystal. Cotton. Brittle silver ore, the mineral stephanite.

A basic sulphate of copper, occurring in emerald-green crystals.

A colorless or white crystalline compound, (CH2)6N4C2H5Br, used as a sedative in epilepsy.

A crystalline substance (chemically, tribromophenol, C6H2Br3OH), used as an antiseptic and disinfectant.

ng of titanic oxide, and hence identical with rutile and octahedrite in composition, but crystallizing in the orthorhombic system.

A white or gray crystalline mineral consisting of the acid phosphate of calcium.

d a large cavity, containing an oily fluid, which, after death, concretes into a whitish crystalline substance called spermaceti. See Sperm whale.

Of, pertaining to, or derived from, cacodyl. Cacodylic acid, a white, crystalline, deliquescent substance, (CH3)2AsO.OH, obtained by the oxidation of cacodyl, and having the properties of an exceedingly stable acid; -- also called alkargen.

or obtained from, coffee. Caffeic acid, an acid obtained from coffee tannin, as a yellow crystalline substance, C9H8O4.

A white, bitter, crystallizable substance, obtained from coffee. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana.

A yellow or smoky brown variety of rock crystal, or crystallized quartz, found esp, in the mountain of Cairngorm, in Scotland.

Calcium carbonate, or carbonate of lime. It is rhombohedral in its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar.

A bitter principle extracted as a white crystalline substance from the calumba root. [Written also colombin, and columbin]

Of, pertaining to, or derived from, camphor. Camphoric acid, a white crystallizable substance, C10H16O4, obtained from the oxidation of camphor.

A mineral occurring in hexagonal crystals, also massive, generally of a yellow color, containing silica, alumina, lime, soda, and carbon dioxide.