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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..

Beryl :: Beryl (n.) A mineral of great hardness, and, when transparent, of much beauty. It occurs in hexagonal prisms, commonly of a green or bluish green color, but also yellow, pink, and white. It is a silicate of aluminium and glucinum (beryllium). The aquamarine is a transparent, sea-green variety used as a gem. The emerald is another variety highly prized in jewelry, and distinguished by its deep color, which is probably due to the presence of a little oxide of chromium..

Basilica :: Basilica (n.) A digest of the laws of Justinian, translated from the original Latin into Greek, by order of Basil I., in the ninth century..

Borosilicate :: Borosilicate (n.) A double salt of boric and silicic acids, as in the natural minerals tourmaline, datolite, etc..

Chondrodite :: Chondrodite (n.) A fluosilicate of magnesia and iron, yellow to red in color, often occurring in granular form in a crystalline limestone..

Hisingerite :: Hisingerite (n.) A soft black, iron ore, nearly earthy, a hydrous silicate of iron..

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..

Boltonite :: Boltonite (n.) A granular mineral of a grayish or yellowish color, found in Bolton, Massachusetts. It is a silicate of magnesium, belonging to the chrysolite family..

Zunyite :: Zunyite (n.) A fluosilicate of alumina occurring in tetrahedral crystals at the Zu/i mine in Colorado.

Chrysolite :: Chrysolite (n.) A mineral, composed of silica, magnesia, and iron, of a yellow to green color. It is common in certain volcanic rocks; -- called also olivine and peridot. Sometimes used as a gem. The name was also early used for yellow varieties of tourmaline and topaz..

Silicify :: Silicify (v. i.) To become converted into silica, or to be impregnated with silica..

Speiss :: Speiss (n.) A regulus consisting essentially of nickel, obtained as a residue in fusing cobalt and nickel ores with silica and sodium carbonate to make smalt..

Scolecite :: Scolecite (n.) A zeolitic mineral occuring in delicate radiating groups of white crystals. It is a hydrous silicate of alumina and lime. Called also lime mesotype.

Bole :: Bole (n.) Any one of several varieties of friable earthy clay, usually colored more or less strongly red by oxide of iron, and used to color and adulterate various substances. It was formerly used in medicine. It is composed essentially of hydrous silicates of alumina, or more rarely of magnesia. See Clay, and Terra alba..

Vesuvianite :: Vesuvianite (n.) A mineral occurring in tetragonal crystals, and also massive, of a brown to green color, rarely sulphur yellow and blue. It is a silicate of alumina and lime with some iron magnesia, and is common at Vesuvius. Also called idocrase..

Metasilicate :: Metasilicate (n.) A salt of metasilicic acid.

Hauynite :: Hauynite (n.) A blue isometric mineral, characteristic of some volcani/ rocks. It is a silicate of alumina, lime, and soda, with sulphate of lime..

Silicon :: Silicon (n.) A nonmetalic element analogous to carbon. It always occurs combined in nature, and is artificially obtained in the free state, usually as a dark brown amorphous powder, or as a dark crystalline substance with a meetallic luster. Its oxide is silica, or common quartz, and in this form, or as silicates, it is, next to oxygen, the most abundant element of the earth's crust. Silicon is characteristically the element of the mineral kingdom, as carbon is of the organic world. Symbol Si. A

Subsisted :: Subsilicate (n.) A basic silicate.

Fayalite :: Fayalite (n.) A black, greenish, or brownish mineral of the chrysolite group. It is a silicate of iron..

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