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Alunogen :: Alunogen (n.) A white fibrous mineral frequently found on the walls of mines and quarries, chiefly hydrous sulphate of alumina; -- also called feather alum, and hair salt..

Dioptase :: Dioptase (n.) A hydrous silicate of copper, occurring in emerald-green crystals..

Pharmacolite :: Pharmacolite (n.) A hydrous arsenate of lime, usually occurring in silky fibers of a white or grayish color..

Goethite :: Goethite (n.) A hydrous oxide of iron, occurring in prismatic crystals, also massive, with a fibrous, reniform, or stalactitic structure. The color varies from yellowish to blackish brown..

Phillipsite :: Phillipsite (n.) A hydrous silicate of aluminia, lime, and soda, a zeolitic mineral commonly occurring in complex twin crystals, often cruciform in shape; -- called also christianite..

Kieserite :: Kieserite (n.) Hydrous sulphate of magnesia found at the salt mines of Stassfurt, Prussian Saxony..

Pandermite :: Pandermite (n.) A hydrous borate of lime, near priceite..

Apophyllite :: Apophyllite (n.) A mineral relating to the zeolites, usually occurring in square prisms or octahedrons with pearly luster on the cleavage surface. It is a hydrous silicate of calcium and potassium..

Stilt :: Stilpnomelane (n.) A black or greenish black mineral occurring in foliated flates, also in velvety bronze-colored incrustations. It is a hydrous silicate of iron and alumina..

Ulexite :: Ulexite (n.) A mineral occurring in white rounded crystalline masses. It is a hydrous borate of lime and soda.

Libethenite :: Libethenite (n.) A mineral of an olive-green color, commonly in orthorhombic crystals. It is a hydrous phosphate of copper..

Iron :: Iron (n.) The most common and most useful metallic element, being of almost universal occurrence, usually in the form of an oxide (as hematite, magnetite, etc.), or a hydrous oxide (as limonite, turgite, etc.). It is reduced on an enormous scale in three principal forms; viz., cast iron, steel, and wrought iron. Iron usually appears dark brown, from oxidation or impurity, but when pure, or on a fresh surface, is a gray or white metal. It is easily oxidized (rusted) by moisture, and is attacked b

Torbernite :: Torbernite (n.) A mineral occurring in emerald-green tabular crystals having a micaceous structure. It is a hydrous phosphate of uranium and copper. Called also copper uranite, and chalcolite..

Okenite :: Okenite (n.) A massive and fibrous mineral of a whitish color, chiefly hydrous silicate of lime..

Vermiculite :: Vermiculite (n.) A group of minerals having, a micaceous structure. They are hydrous silicates, derived generally from the alteration of some kind of mica. So called because the scales, when heated, open out into wormlike forms..

Cerite :: Cerite (n.) A mineral of a brownish of cherry-red color, commonly massive. It is a hydrous silicate of cerium and allied metals..

Zeolite :: Zeolite (n.) A term now used to designate any one of a family of minerals, hydrous silicates of alumina, with lime, soda, potash, or rarely baryta. Here are included natrolite, stilbite, analcime, chabazite, thomsonite, heulandite, and others. These species occur of secondary origin in the cavities of amygdaloid, basalt, and lava, also, less frequently, in granite and gneiss. So called because many of these species intumesce before the blowpipe..

Turquois :: Turquois (n.) A hydrous phosphate of alumina containing a little copper; calaite. It has a blue, or bluish green, color, and usually occurs in reniform masses with a botryoidal surface..

Carnallite :: Carnallite (n.) A hydrous chloride of potassium and magnesium, sometimes found associated with deposits of rock salt..

Bismuthyl :: Bismuthyl (n.) Hydrous carbonate of bismuth, an earthy mineral of a dull white or yellowish color..

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