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Cyanite :: Cyanite (n.) A mineral occuring in thin-bladed crystals and crystalline aggregates, of a sky-blue color. It is a silicate of aluminium..

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..

Serpentinize :: Serpentinize (v. t.) To convert (a magnesian silicate) into serpentine.

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..

Brewsterite :: Brewsterite (n.) A rare zeolitic mineral occurring in white monoclinic crystals with pearly luster. It is a hydrous silicate of aluminia, baryta, and strontia..

Pimelite :: Pimelite (n.) An apple-green mineral having a greasy feel. It is a hydrous silicate of nickel, magnesia, aluminia, and iron..

Topaz :: Topaz (n.) A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenesh, bluish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem..

Spoffish :: Spodumene (n.) A mineral of a white to yellowish, purplish, or emerald-green color, occuring in prismatic crystals, often of great size. It is a silicate of aluminia and lithia. See Hiddenite..

Zoisite :: Zoisite (n.) A grayish or whitish mineral occurring in orthorhombic, prismatic crystals, also in columnar masses. It is a silicate of alumina and lime, and is allied to epidote..

Eulytite :: Eulytite (n.) A mineral, consisting chiefly of the silicate of bismuth, found at Freiberg; -- called also culytine..

Greensand :: Greensand (n.) A variety of sandstone, usually imperfectly consolidated, consisting largely of glauconite, a silicate of iron and potash of a green color, mixed with sand and a trace of phosphate of lime..

Potassium :: Potassium (n.) An Alkali element, occurring abundantly but always combined, as in the chloride, sulphate, carbonate, or silicate, in the minerals sylvite, kainite, orthoclase, muscovite, etc. Atomic weight 39.0. Symbol K (Kalium)..

Pectolite :: Pectolite (n.) A whitish mineral occurring in radiated or fibrous crystalline masses. It is a hydrous silicate of lime and soda.

Meerschaum :: Meerschaum (n.) A fine white claylike mineral, soft, and light enough when in dry masses to float in water. It is a hydrous silicate of magnesia, and is obtained chiefly in Asia Minor. It is manufacturd into tobacco pipes, cigar holders, etc. Also called sepiolite..

Harmotome :: Harmotome (n.) A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross-stone..

Thomsonite :: Thomsonite (n.) A zeolitic mineral, occurring generally in masses of a radiated structure. It is a hydrous silicate of aluminia, lime, and soda. Called also mesole, and comptonite..

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

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..

Mesolite :: Mesolite (n.) A zeolitic mineral, grayish white or yellowish, occuring in delicate groups of crystals, also fibrous massive. It is a hydrous silicate of alumina, lime, and soda..

Fluosilicate :: Fluosilicate (n.) A double fluoride of silicon and some other (usually basic) element or radical, regarded as a salt of fluosilicic acid; -- called also silicofluoride..

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