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Taurine :: Taurine (n.) A body occurring in small quantity in the juices of muscle, in the lungs, and elsewhere, but especially in the bile, where it is found as a component part of taurocholic acid, from which it can be prepared by decomposition of the acid. It crystallizes in colorless, regular six-sided prisms, and is especially characterized by containing both nitrogen and sulphur, being chemically amido-isethionic acid, C2H7NSO3..

Apatite :: Apatite (n.) Native phosphate of lime, occurring usually in six-sided prisms, color often pale green, transparent or translucent..

Tourmaline :: Tourmaline (n.) A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels..

Yenite :: Yenite (n.) A silicate of iron and lime occurring in black prismatic crystals; -- also called ilvaite.

Flint Glass :: Flint glass () A soft, heavy, brilliant glass, consisting essentially of a silicate of lead and potassium. It is used for tableware, and for optical instruments, as prisms, its density giving a high degree of dispersive power; -- so called, because formerly the silica was obtained from pulverized flints. Called also crystal glass. Cf. Glass..

Prismatical :: Prismatical (a.) Same as Orthorhombic.

Iceland Spar :: Iceland spar () A transparent variety of calcite, the best of which is obtained in Iceland. It is used for the prisms of the polariscope, because of its strong double refraction. Cf. Calcite..

Carbon :: Carbon (n.) An elementary substance, not metallic in its nature, which is present in all organic compounds. Atomic weight 11.97. Symbol C. it is combustible, and forms the base of lampblack and charcoal, and enters largely into mineral coals. In its pure crystallized state it constitutes the diamond, the hardest of known substances, occuring in monometric crystals like the octahedron, etc. Another modification is graphite, or blacklead, and in this it is soft, and occurs in hexagonal prisms or t

Anglesite :: Anglesite (n.) A native sulphate of lead. It occurs in white or yellowish transparent, prismatic crystals..

Vessel :: Vessel (n.) A continuous tube formed from superposed large cylindrical or prismatic cells (tracheae), which have lost their intervening partitions, and are usually marked with dots, pits, rings, or spirals by internal deposition of secondary membranes; a duct..

Brachydiagonal :: Brachydiagonal (a.) Pertaining to the shorter diagonal, as of a rhombic prism..

Refringent :: Refringent (a.) Pertaining to, or possessing, refringency; refractive; refracting; as, a refringent prism of spar..

Gieseckite :: Gieseckite (n.) A mineral occurring in greenish gray six-sided prisms, having a greasy luster. It is probably a pseudomorph after elaeolite..

Prismatical :: Prismatical (a.) Resembling, or pertaining to, a prism; as, a prismatic form or cleavage..

Macropyramid :: Macropyramid (n.) See Macroprism.

Hopeite :: Hopeite (n.) A hydrous phosphate of zinc in transparent prismatic crystals.

Dipleidoscope :: Dipleidoscope (n.) An instrument for determining the time of apparent noon. It consists of two mirrors and a plane glass disposed in the form of a prism, so that, by the reflections of the sun's rays from their surfaces, two images are presented to the eye, moving in opposite directions, and coinciding at the instant the sun's center is on the meridian..

Dihexagonal :: Dihexagonal (a.) Having twelve similar faces; as, a dihexagonal prism..

Warwickite :: Warwickite (n.) A dark brown or black mineral, occurring in prismatic crystals imbedded in limestone near Warwick, New York. It consists of the borate and titanate of magnesia and iron..

Strontic :: Strontianite (n.) Strontium carbonate, a mineral of a white, greenish, or yellowish color, usually occurring in fibrous massive forms, but sometimes in prismatic crystals..

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