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A mineral of a steel-gray to black color and metallic luster, occurring crystallized, often in twin crystals shaped like cogwheels (wheel ore), also massive. It is a sulphide of antimony, lead, and copper.

, as of a rhombic prism. Brachydiagonal axis, the shorter lateral axis of an orthorhombic crystal.

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.

To utter a loud, harsh cry, as an ass. Laugh, and they Return it louder than an ass can bray. Dryden.

ance 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.

sed 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.

ing 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.

See Cryptogamia.

To make a hollow or humming noise, like that of a bumblebee; to cry as a bittern. As a bittern bumbleth in the mire. Chaucer.

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

To make a sharp, broken noise or cry, as a hen or goose does. When every goose is cackling. Shak.

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.