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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..

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..

Albite :: Albite (n.) A mineral of the feldspar family, triclinic in crystallization, and in composition a silicate of alumina and soda. It is a common constituent of granite and of various igneous rocks. See Feldspar..

Dawsonite :: Dawsonite (n.) A hydrous carbonate of alumina and soda, occuring in white, bladed crustals..

Leucite :: Leucite (n.) A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius..

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..

Cabazite :: Cabazite (n.) A mineral occuring in glassy rhombohedral crystals, varying, in color from white to yellow or red. It is essentially a hydrous silicate of alumina and lime. Called also chabasie..

Sapphire :: Sapphire (n.) Native alumina or aluminium sesquioxide, Al2O3; corundum; esp., the blue transparent variety of corundum, highly prized as a gem..

Scapolite :: Scapolite (n.) A grayish white mineral occuring in tetragonal crystals and in cleavable masses. It is essentially a silicate of alumina and soda.

Sesquioxide :: Sesquioxide (n.) An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance; thus, alumina, Al2O3 is a sesquioxide..

Vesuvianite :: Vesuvianite (n.) A mineral occurring in tetragonal crystals, and also massive, of a brown to green color, rarely sulphur yellow and blue. It is a silicate of alumina and lime with some iron magnesia, and is common at Vesuvius. Also called idocrase..

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..

Alum Stone :: Alum stone () A subsulphate of alumina and potash; alunite.

Iolite :: Iolite (n.) A silicate of alumina, iron, and magnesia, having a bright blue color and vitreous luster; cordierite. It is remarkable for its dichroism, and is also called dichroite..

Lazulite :: Lazulite (n.) A mineral of a light indigo-blue color, occurring in small masses, or in monoclinic crystals; blue spar. It is a hydrous phosphate of alumina and magnesia..

Aluminiform :: Aluminiform (a.) Having the form of alumina.

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

Aluminous :: Aluminous (a.) Pertaining to or containing alum, or alumina; as, aluminous minerals, aluminous solution..

Aluminated :: Aluminated (a.) Combined with 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..

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