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A mineral of a brownish red color and vitreous luster, consisting chiefly of the silicates of iron, zirconia, and lime.

a mineral, consisting chiefly of the silicate of bismuth, found at Freiberg; -- called also culytine.

A black, greenish, or brownish mineral of the chrysolite group. It is a silicate of iron.

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…

A silicate of alumina, of fibrous or columnar structure. It is like andalusite in composition; -- called also sillimanite, and bucholizite.

ken flints set in the mortar, with quions of masonry. -- Liquor of flints, a solution of silica, or flints, in potash. -- To skin a flint, to be capable of, or guilty of, any expedient or any meanness for making money. [Colloq.]

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…

A combining form indicating fluorine as an ingredient; as in fluosilicate, fluobenzene.

btained in solution in water as a sour fuming liquid, and regarded as the type of the fluosilicates; -- called also silicofluoric acid, and hydrofluosilicic acid.

A vitreous compound, used by potters in glazing, consisting of lime, silica, borax, lead, and soda.

A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron.

An amorphous mineral of apple-green color; a hydrous silicate of nickel and magnesia. It is an important ore of nickel.

A loose hydrated form of silica, a variety of opal, deposited in concretionary cauliflowerlike masses, around some hot springs and geysers.

A native hydrated silicate of alumina, lime, and potash, first noticed near Rome.

ance, white or colored, having a conchoidal fracture, and made by fusing together sand or silica with lime, potash, soda, or lead oxide. It is used for window panes and mirrors, for articles of table and culinary use, for lenses, and various articles of ornament.

ineral characteristic of the greensand of the chalk and other formations. It is a hydrous silicate of iron and potash. See Greensand.

nesium. It never occurs naturally in the free state, but is always combined, usually with silica or alumina, or both; as in the minerals phenacite, chrysoberyl, beryl or emerald, euclase, and danalite. It was named from its oxide glucina, which was known long before the element was isolated. Symbol Gl. Atomic weight 9.…

riety 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.

A hydrous silicate of magnesia.

A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross-stone.