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A mineral of a bluish gray color and metallic luster, usually in plumose masses, also compact. It is sulphide of antimony and lead.

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.

A kind of mineral coal, or brown lignite, burning with a weak flame, and generally a disagreeable odor; -- found at Bovey Tracey, Devonshire, England. It is of geological age of the oölite, and not of the true coal era.

A rock composed of angular fragments either of the same mineral or of different minerals, etc., united by a cement, and commonly presenting a variety of colors. Bone breccia, a breccia containing bones, usually fragmentary. -- Coin breccia, a breccia containing coins.

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

Farewell, thou pretty, brittle piece Of fine-cut crystal. Cotton. Brittle silver ore, the mineral stephanite.

ound in minute quantities in sea water, and in many saline springs. It occurs also in the mineral bromyrite.

Silver bromide, a rare mineral; -- called also bromargyrite.

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

A white, pearly mineral, occurring thin and foliated, like talc, and also fibrous; a native magnesium hydrate.

To break; as in a mortar; to bray, as minerals, roots, etc.; to crush. Nor bruise her flowerets with the armed hoofs. Shak.

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

An apple-green mineral, a hydrous arseniate of nickel, cobalt, and magnesia; -- so named from the Sierra Cabrera, Spain.

c which collects on the sides of furnaces where zinc is sublimed. Formerly applied to the mineral calamine.

A rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro-positive substance known. Symbol Cs. Atomic weight 132.6.

A mineral. See Turquoise.

A mineral, the hydrous silicate of zinc.

A bronze-yellow massive mineral with metallic luster; a telluride of gold; -- first found in Calaveras County California.

The substance which remains when a metal or mineral has been subjected to calcination or combustion by heat, and which is, or may be, reduced to a fine powder.

e wall or side of an enemy's gallery, to blow in the earth and cut off the retreat of the miners. Farrow.