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Aluminate :: Aluminate (n.) A compound formed from the hydrate of aluminium by the substitution of a metal for the hydrogen.

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

Chlorite :: Chlorite (n.) The name of a group of minerals, usually of a green color and micaceous to granular in structure. They are hydrous silicates of alumina, iron, and magnesia..

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..

Euclase :: Euclase (n.) A brittle gem occurring in light green, transparent crystals, affording a brilliant clinodiagonal cleavage. It is a silicate of alumina and glucina..

Gibbsite :: Gibbsite (n.) A hydrate of alumina.

Stile :: Stilbite (n.) A common mineral of the zeolite family, a hydrous silicate of alumina and lime, usually occurring in sheaflike aggregations of crystals, also in radiated masses. It is of a white or yellowish color, with pearly luster on the cleavage surface. Called also desmine..

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

Ultramarine :: Ultramarine (n.) A blue pigment formerly obtained by powdering lapis lazuli, but now produced in large quantities by fusing together silica, alumina, soda, and sulphur, thus forming a glass, colored blue by the sodium polysulphides made in the fusion. Also used adjectively..

Ralstonite :: Ralstonite (n.) A fluoride of alumina and soda occurring with the Greenland cryolite in octahedral crystals.

Diaspore :: Diaspore (n.) A hydrate of alumina, often occurring in white lamellar masses with brilliant pearly luster; -- so named on account of its decrepitating when heated before the blowpipe..

Prehnite :: Prehnite (n.) A pale green mineral occurring in crystalline aggregates having a botryoidal or mammillary structure, and rarely in distinct crystals. It is a hydrous silicate of alumina and lime..

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..

Wadd :: Wadd (n.) An earthy oxide of manganese, or mixture of different oxides and water, with some oxide of iron, and often silica, alumina, lime, or baryta; black ocher. There are several varieties..

Saponite :: Saponite (n.) A hydrous silicate of magnesia and alumina. It occurs in soft, soapy, amorphous masses, filling veins in serpentine and cavities in trap rock..

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..

Harmotome :: Harmotome (n.) A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross-stone..

Fibrolite :: Fibrolite (n.) A silicate of alumina, of fibrous or columnar structure. It is like andalusite in composition; -- called also sillimanite, and bucholizite..

Aluminium :: Aluminium (n.) The metallic base of alumina. This metal is white, but with a bluish tinge, and is remarkable for its resistance to oxidation, and for its lightness, having a specific gravity of about 2.6. Atomic weight 27.08. Symbol Al..

Ripidolite :: Ripidolite (n.) A translucent mineral of a green color and micaceous structure, belonging to the chlorite group; a hydrous silicate of alumina, magnesia, and iron; -- called also clinochlore..

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