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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..

Zunyite :: Zunyite (n.) A fluosilicate of alumina occurring in tetrahedral crystals at the Zu/i mine in Colorado.

Beauxite :: Beauxite (n.) A ferruginous hydrate of alumina. It is largely used in the preparation of aluminium and alumina, and for the lining of furnaces which are exposed to intense heat..

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..

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..

Corundum :: Corundum (n.) The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond..

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..

Sodalite :: Sodalite (n.) A mineral of a white to blue or gray color, occuring commonly in dodecahedrons, also massive. It is a silicate of alumina and soda with some chlorine..

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

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

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..

Scolecite :: Scolecite (n.) A zeolitic mineral occuring in delicate radiating groups of white crystals. It is a hydrous silicate of alumina and lime. Called also lime mesotype.

Epistilbite :: Epistilbite (n.) A crystallized, transparent mineral of the Zeolite family. It is a hydrous silicate of alumina and lime..

Topaz :: Topaz (n.) A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenesh, bluish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem..

Lazuli :: Lazuli (n.) A mineral of a fine azure-blue color, usually in small rounded masses. It is essentially a silicate of alumina, lime, and soda, with some sodium sulphide, is often marked by yellow spots or veins of sulphide of iron, and is much valued for ornamental work. Called also lapis lazuli, and Armenian stone..

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..

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

Wootz :: Wootz (n.) A species of steel imported from the East Indies, valued for making edge tools; Indian steel. It has in combination a minute portion of alumina and silica..

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

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..

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