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rhombohedral crystals, varying, in color from white to yellow or red. It is essentially a hydrous silicate of alumina and lime. Called also chabasie.

up of minerals, usually of a green color and micaceous to granular in structure. They are hydrous silicates of alumina, iron, and magnesia. Chlorite slate, a schistose or slaty rock consisting of alumina, iron, and magnesia.

A massive mineral, greenish in color, and opal-like in appearance. It is essentially a hydrous silicate of iron.

A hydrous silicate of copper, occurring massive, of a blue or greenish blue color.

A soft earth, which is plastuc, or may be molded with the hands, consisting of hydrous silicate of alumunium. It is the result of the wearing down and decomposition, in part, of rocks containing aluminous minerals, as granite. Lime, magnesia, oxide of iron, and other ingredients, are often present as impurities.…

wer valence. Cobaltous chloride, a crystalline compound, CoCl2, of a pale rose color when hydrous, blue when dehydrated. Its solution is used for a sympathetic ink, the writing being nearly colorless when dried in the air, owing to absorbed moisture, and becoming bright blue when warmed.

A hydrous borate of lime occurring in transparent colorless or white crystals, also massive, in Southern California.

cube; thus, 3 is the cube root of 27, for 3x3x3 = 27. -- Cube spar (Min.), anhydrite; anhydrous calcium sulphate.

A hydrous carbonate of alumina and soda, occuring in white, bladed crustals.

A hydrous silicate of copper, occurring in emerald-green crystals.

A mineral of a blackish green color, commonly massive or in nodules. It is a hydrous phosphate of iron.

A grayish white zeolitic mineral, in tetragonal crystals. It is a hydrous silicate of alumina and baryta.

A mineral of a green color and pearly luster; a hydrous phosphate of copper.

A hydrous phosphate of alumina and manganese. It is generally of a rose-pink color, -- whence the name.

A crystallized, transparent mineral of the Zeolite family. It is a hydrous silicate of alumina and lime.

A hydrous arseniate of copper, of an emerald-green color; -- so called from Erin, or Ireland, where it occurs.

A rose-red mineral, crystallized and earthy, a hydrous arseniate of cobalt, known also as cobalt bloom; -- called also erythrin or erythrine.

A mineral occurring in transparent emerald green crystals. It is hydrous arseniate of copper.

An amorphous mineral of apple-green color; a hydrous silicate of nickel and magnesia. It is an important ore of nickel.

green mineral characteristic of the greensand of the chalk and other formations. It is a hydrous silicate of iron and potash. See Greensand.