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A mineral occuring in glassy rhombohedral crystals, varying, in color from white to yellow or red. It is essentially a hydrous silicate of alumina and lime. Called also chabasie.

Native copper sulphide, called also copper glance, and vitreous copper; a mineral of a black color and metallic luster. [Formerly written chalcosine.]

of clay and black lead, or the like, used in the same manner. See Crayon. Black chalk, a mineral of a bluish color, of a slaty texture, and soiling the fingers when handled; a variety of argillaceous slate. -- By a long chalk, by a long way; by many degrees. [Slang] Lowell. -- Chalk drawing (Fine Arts), a drawing ma…

A cavity in a mine, usually of a cubical form, to contain the powder.

-- Charcoal point, a carbon pencil prepared for use un an electric light apparatus. -- Mineral charcoal, a term applied to silky fibrous layers of charcoal, interlaminated in beds of ordinary bituminous coal; -- known to miners as mother of coal.

Changeableness of color, as in a mineral; play of colors. Cleaceland.

The mineral azurite, found in fine crystallization at Chessy, near Lyons; called also chessylite.

Principal or most eminent in any quality or action; most distinguished; having most influence; taking the lead; most important; as, the chief topic of conversation; the chief interest of man.

In the first place; principally; preëminently; above; especially. Search through this garden; leave unsearched no nook; But chiefly where those two fair creatures lodge. Milton.

ent. Symbol Cl. Atomic weight, 35.4. Chlorine family, the elements fluorine, chlorine, bromine, and iodine, called the halogens, and classed together from their common peculiariries.

The name of a group of minerals, usually of a green color and micaceous to granular in structure. They are hydrous silicates of alumina, iron, and magnesia. Chlorite slate, a schistose or slaty rock consisting of alumina, iron, and magnesia.

A massive mineral, greenish in color, and opal-like in appearance. It is essentially a hydrous silicate of iron.

In a preferable or excellent manner; excellently; eminently. "Choicely good." Walton.

A peculiar rounded granule of some mineral, usually enstatite or chrysolite, found imdedded more or less aboundantly in the mass of many meteoric stones, which are hence called chondrites.

Joseph Hall (1574 -- 1656), Bishop of Norwich, a divine eminent as a moralist.

A black submetallic mineral consisting of oxide of chromium and iron; -- called also chromic iron.

A comparatively rare element occurring most abundantly in the mineral chromite. Atomic weight 52.5. Symbol Cr. When isolated it is a hard, brittle, grayish white metal, fusible with difficulty. Its chief commercial importance is for its compounds, as potassium chromate, lead chromate, etc., which are brilliantly colore…

A mineral, found in crystals, of a yellow to green or brown color, and consisting of aluminia and glucina. It is very hard, and is often used as a gem.

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.

ing; not easily wrought; as, a churlish soil; the churlish and intractable nature of some minerals. Boyle.