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

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..

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

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

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

Scheelite :: Scheelite (n.) Calcium tungstate, a mineral of a white or pale yellowish color and of the tetragonal system of crystallization..

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

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..

Quadratic :: Quadratic (a.) Tetragonal.

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

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..

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

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

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

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..

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

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..

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

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..

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