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

Quadratic :: Quadratic (a.) Tetragonal.

Tetragonal :: Tetragonal (a.) Having four prominent longitudinal angles.

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..

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..

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

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

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..

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

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

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

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..

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

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

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..

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

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..

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