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f tin; -- used for making bells. Bell metal ore, a sulphide of tin, copper, and iron; the mineral stannite.

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…

the base is as two to one. The bisilicates include many of the most common and important minerals.

sed in the flame of a candle. It is found in a native state, and as a constituent of some minerals. Specific gravity 9.8. Atomic weight 207.5. Symbol Bi.

Hydrous carbonate of bismuth, an earthy mineral of a dull white or yellowish color. [Written also bismuthite.]

Mineral pitch; a black, tarry substance, burning with a bright flame; Jew's pitch. It occurs as an abundant natural product in many places, as on the shores of the Dead and Caspian Seas. It is used in cements, in the construction of pavements, etc. See Asphalt.

latile bituminous matter. It burns with a yellow smoky flame. -- Bituminous limestone, a mineral of a brown or black color, emitting an unpleasant smell when rubbed. That of Dalmatia is so charged with bitumen that it may be cut like soap. -- Bituminous shale, an argillaceous shale impregnated with bitumen, often acc…

A name given by English miners to sphalerite, or zinc blende; - - called also false galena. See Blende.

Ore, not in masses, but mixed with other minerals.

A mineral, called also sphalerite, and by miners mock lead, false galena, and black-jack. It is a zinc sulphide, but often contains some iron. Its color is usually yellow, brown, or black, and its luster resinous.

A popular term for a bright-hued variety of some minerals; as, the rose-red cobalt bloom.

Low spirits; a fit of despondency; melancholy. [Colloq.] Berlin blue, Prussian blue. -- Mineral blue. See under Mineral. -- Prussian blue. See under Prussian.

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

A substance composed of ground bone, mineral matters, etc., hardened by pressure, and used for making billiard balls, boxes, etc.

A mineral of a white or gray color occurring massive and in isometric crystals; in composition it is a magnesium borate with magnesium chloride.

s, making enamels, fixing colors on porcelain, and as a soap. It occurs native in certain mineral springs, and is made from the boric acid of hot springs in Tuscany. It was originally obtained from a lake in Thibet, and was sent to Europe under the name of tincal. Borax is a pyroborate or tetraborate of sodium, Na2B4O7…

er properties. It occurs in nature also in boracite, datolite, tourmaline, and some other minerals. Atomic weight 10.9. Symbol B.

A double salt of boric and silicic acids, as in the natural minerals tourmaline, datolite, etc.

Having the form of a bunch of grapes; like a cluster of grapes, as a mineral presenting an aggregation of small spherical or spheroidal prominences.

The act or the process of putting anything into bottles (as beer, mineral water, etc.) and corking the bottles.