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Sanidine :: Sanidine (n.) A variety of orthoclase feldspar common in certain eruptive rocks, as trachyte; -- called also glassy feldspar..

Hyaline :: Hyaline (a.) Glassy; resembling glass; consisting of glass; transparent, like crystal..

Natrolite :: Natrolite (n.) A zeolite occuring in groups of glassy acicular crystals, and in masses which often have a radiated structure. It is a hydrous silicate of alumina and soda..

Hypocrystalline :: Hypocrystalline (a.) Partly crystalline; -- said of rock which consists of crystals imbedded in a glassy ground mass.

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..

Glassiness :: Glassiness (n.) The quality of being glassy.

Axinite :: Axinite (n.) A borosilicate of alumina, iron, and lime, commonly found in glassy, brown crystals with acute edges..

Vitriol :: Vitriol (n.) A sulphate of any one of certain metals, as copper, iron, zinc, cobalt. So called on account of the glassy appearance or luster..

Devitrification :: Devitrification (n.) The act or process of devitrifying, or the state of being devitrified. Specifically, the conversion of molten glassy matter into a stony mass by slow cooling, the result being the formation of crystallites, microbites, etc., in the glassy base, which are then called devitrification products..

Vitrify :: Vitrify (v. t.) To convert into, or cause to resemble, glass or a glassy substance, by heat and fusion..

Glass :: Glass (v. t.) Any substance having a peculiar glassy appearance, and a conchoidal fracture, and usually produced by fusion..

Enamel :: Enamel (v. t.) A glassy, opaque bead obtained by the blowpipe..

Glassy :: Glassy (a.) Dull; wanting life or fire; lackluster; -- said of the eyes.

Glassy :: Glassy (a.) Made of glass; vitreous; as, a glassy substance..

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..

Datolite :: Datolite (n.) A borosilicate of lime commonly occuring in glassy,, greenish crystals..

Phenacite :: Phenacite (n.) A glassy colorless mineral occurring in rhombohedral crystals, sometimes used as a gem. It is a silicate of glucina, and receives its name from its deceptive similarity to quartz..

Leucite :: Leucite (n.) A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius..

Pearlstone :: Pearlstone (n.) A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under Perlitic..

Vitreous :: Vitreous (a.) Consisting of, or resembling, glass; glassy; as, vitreous rocks..

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