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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..

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..

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..

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

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

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

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..

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

Quadratic :: Quadratic (a.) Tetragonal.

Phosgenite :: Phosgenite (n.) A rare mineral occurring in tetragonal crystals of a white, yellow, or grayish color and adamantine luster. It is a chlorocarbonate of lead..

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

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

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..

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

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

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..

Tetragon :: Tetragon (n.) An aspect of two planets with regard to the earth when they are distant from each other ninety degrees, or the fourth of a circle..

Trapezohedron :: Trapezohedron (n.) A solid bounded by twenty-four equal and similar trapeziums; a tetragonal trisoctahedron. See the Note under Trisoctahedron.

Tetragon :: Tetragon (n.) A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc..

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..

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