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A mineral of a yellowish color, consisting chiefly of silica, glucina, manganese, and iron, with a little sulphur.

A red consisting of silica, borax, and soda, fused with oxide of copper and iron, and used in enamels, mosaics, etc.

and also in monoclinic crystals with pearly luster on the cleavage face. It is a hydrous silicate of alumina and lime.

A soft black, iron ore, nearly earthy, a hydrous silicate of iron.

A borosilicate of iron and lime, near datolite in form and composition.

l of a transparent vitreous brown color, found in the ejected masses of Vesuvius. It is a silicate of iron and magnesia, containing fluorine.

lphuric acid on fluorite, and is usually collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha.

A silicate of iron and lime occurring in black prismatic crystals and columnar masses.

tensely blue and black. -- Indian red. (a) A purplish red earth or pigment composed of a silicate of iron and alumina, with magnesia. It comes from the Persian Gulf. Called also Persian red. (b) See Almagra. -- Indian rice (Bot.), a reedlike water grass. See Rice. -- Indian shot (Bot.), a plant of the genus Canna (C…

A silicate of alumina, iron, and magnesia, having a bright blue color and vitreous luster; cordierite. It is remarkable for its dichroism, and is also called dichroite.

A fibrous mineral occurring in tufts of a straw-yellow color. It is a hydrous silicate of alumina and manganese.

A mineral of a brownish black color, related to titanite in form. It consists chiefly of silica, titanium dioxide, lime, and yttria.

A mineral of a gray, red, brown, or green color, and glistening luster. It is a silicate of iron and manganese.

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. [Written also laumonite.]

mineral of a fine azure-blue color, usually in small rounded masses. It is essentially a silicate of alumina, lime, and soda, with some sodium sulphide, is often marked by yellow spots or veins of sulphide of iron, and is much valued for ornamental work. Called also lapis lazuli, and Armenian stone.…

ineral 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.

A mineral of a greenish yellow color; it is a silicate of glucina, lime, and soda with fluorine. Called also leucophanite.

A mineral related to the micas, but low in silica and yielding brittle folia with pearly luster.

ike 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.

yellowish, occuring in delicate groups of crystals, also fibrous massive. It is a hydrous silicate of alumina, lime, and soda.