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Feldspath :: Feldspath (n.) A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish..

Laumontite :: Laumontite (n.) A mineral, of a white color and vitreous luster. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles..

Chalcocite :: Chalcocite (n.) Native copper sulphide, called also copper glance, and vitreous copper; a mineral of a black color and metallic luster..

Eudialyte :: Eudialyte (n.) A mineral of a brownish red color and vitreous luster, consisting chiefly of the silicates of iron, zirconia, and lime..

Tyrolite :: Tyrolite (n.) A translucent mineral of a green color and pearly or vitreous luster. It is a hydrous arseniate of copper.

Depolishing :: Depolishing (n.) The process of removing the vitreous glaze from porcelain, leaving the dull luster of the surface of ivory porcelain..

Hyalospongia :: Hyalospongia (n. pl.) An order of vitreous sponges, having glassy six-rayed, siliceous spicules; -- called also Hexactinellinae..

Vitreous :: Vitreous (a.) Of or pertaining to glass; derived from glass; as, vitreous electricity..

Glass-rope :: Glass-rope (n.) A remarkable vitreous sponge, of the genus Hyalonema, first brought from Japan. It has a long stem, consisting of a bundle of long and large, glassy, siliceous fibers, twisted together..

Pecten :: Pecten (n.) A vascular pigmented membrane projecting into the vitreous humor within the globe of the eye in birds, and in many reptiles and fishes; -- also called marsupium..

Reclination :: Reclination (n.) The act or process of removing a cataract, by applying the needle to its anterior surface, and depressing it into the vitreous humor in such a way that the front surface of the cataract becomes the upper one and its back surface the lower one..

Paste :: Paste (n.) A highly refractive vitreous composition, variously colored, used in making imitations of precious stones or gems. See Strass..

Glaze :: Glaze (n.) The vitreous coating of pottery or porcelain; anything used as a coating or color in glazing. See Glaze, v. t., 3..

Argentite :: Argentite (n.) Sulphide of silver; -- also called vitreous silver, or silver glance. It has a metallic luster, a lead-gray color, and is sectile like lead..

Glass-sponge :: Glass-sponge (n.) A siliceous sponge, of the genus Hyalonema, and allied genera; -- so called from their glassy fibers or spicules; -- called also vitreous sponge. See Glass-rope, and Euplectella..

Garnet :: Garnet (n.) A mineral having many varieties differing in color and in their constituents, but with the same crystallization (isometric), and conforming to the same general chemical formula. The commonest color is red, the luster is vitreous, and the hardness greater than that of quartz. The dodecahedron and trapezohedron are the common forms..

Resin :: Resin (n.) Any one of a class of yellowish brown solid inflammable substances, of vegetable origin, which are nonconductors of electricity, have a vitreous fracture, and are soluble in ether, alcohol, and essential oils, but not in water; specif., pine resin (see Rosin)..

Devitrify :: Devitrify (v. t.) To deprive of glasslike character; to take away vitreous luster and transparency from.

Tachylyte :: Tachylyte (n.) A vitreous form of basalt; -- so called because decomposable by acids and readily fusible.

Humite :: Humite (n.) A mineral of a transparent vitreous brown color, found in the ejected masses of Vesuvius. It is a silicate of iron and magnesia, containing fluorine..

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