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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..

Quadrangular :: Quadrangular (a.) Having four angles, and consequently four sides; tetragonal..

Chalcopyrite :: Chalcopyrite (n.) Copper pyrites, or yellow copper ore; a common ore of copper, containing copper, iron, and sulphur. It occurs massive and in tetragonal crystals of a bright brass yellow color..

Edingtonite :: Edingtonite (n.) A grayish white zeolitic mineral, in tetragonal crystals. It is a hydrous silicate of alumina and baryta..

Isodiametric :: Isodiametric (a.) Developed alike in the directions of the several lateral axes; -- said of crystals of both the tetragonal and hexagonal systems.

Pyramidal :: Pyramidal (a.) Same as Tetragonal.

Dimetric :: Dimetric (a.) Same as Tetragonal.

Tetragonal :: Tetragonal (a.) Of or pertaining to a tetragon; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers..

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

Wulfenite :: Wulfenite (n.) Native lead molybdate occurring in tetragonal crystals, usually tabular, and of a bright orange-yellow to red, gray, or brown color; -- also called yellow lead ore..

Zircon :: Zircon (n.) A mineral occurring in tetragonal crystals, usually of a brown or gray color. It consists of silica and zirconia. A red variety, used as a gem, is called hyacinth. Colorless, pale-yellow or smoky-brown varieties from Ceylon are called jargon..

Rutile :: Rutile (n.) A mineral usually of a reddish brown color, and brilliant metallic adamantine luster, occurring in tetragonal crystals. In composition it is titanium dioxide, like octahedrite and brookite..

Tetragonal :: Tetragonal (a.) Designating, or belonging to, a certain system of crystallization; dimetric. See Tetragonal system, under Crystallization..

Polianite :: Polianite (n.) Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz..

Cassiterite :: Cassiterite (n.) Native tin dioxide; tin stone; a mineral occurring in tetragonal crystals of reddish brown color, and brilliant adamantine luster; also massive, sometimes in compact forms with concentric fibrous structure resembling wood (wood tin), also in rolled fragments or pebbly (Stream tin). It is the chief source of metallic tin. See Black tin, under Black..

Leucitoid :: Leucitoid (n.) The trapezohedron or tetragonal trisoctahedron; -- so called as being the form of the mineral leucite.

Xenotime :: Xenotime (n.) A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals.

Icositetrahedron :: Icositetrahedron (n.) A twenty-four-sided solid; a tetragonal trisoctahedron or trapezohedron.

Quadratic :: Quadratic (a.) Tetragonal.

Zirconoid :: Zirconoid (n.) A double eight-sided pyramid, a form common with tetragonal crystals; -- so called because this form often occurs in crystals of zircon..

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