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Calcium carbonate, or carbonate of lime. It is rhombohedral in its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar.

A mineral of a white or gray color, occurring massive or crystallized. It is a compound of the carbonates of barium and calcium.

Limestone containing a large percentage of iron carbonate, and hence turning brown on exposure.

Nitrate of calcium, a substance having a grayish white color, occuring in efforescences on old walls, and in limestone caves, especially where there exists decaying animal matter.

ce; or the substance having such forms; -- as, carbonate of lime occurs in the allomorphs calcite and aragonite.

pied, wholly or in part, by nodules or geodes of different minerals, esp. agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava.

See under Calcite.

A mineral identical in composition with calcite or carbonate of lime, but differing from it in its crystalline form and some of its physical characters.

A siliceous variety of calcite, or carbonate of lime, having a silvery-white, pearly luster, and a waving or curved lamellar structure.

d birch bark, in times of scarcity. This name is also given to a white powdery variety of calcite.

See under Calcite.

Same as Calcite.

See under Calcite.

Partaking of the nature ofcalcite or calcium carbonate; consisting of, or containg, calcium carbonate or carbonate of lime. Clcareous spar. See as Calcite.

Bearing producing, or containing calcite, or carbonate of lime. Calciferouse epoch (Geol.), and epoch in the American lower Silurian system, immediately succeeding the Cambrian period. The name alludes to the peculiar mixture of calcareous and siliceous characteristics in many of the beds. See the Diagram under Grology…

. -- Compound crystal. See under Compound. -- Iceland crystal, a transparent variety of calcite, or crystallized calcium carbonate, brought from Iceland, and used in certain optical instruments, as the polariscope. -- Rock crystal, or Mountain crystal, any transparent crystal of quartz, particularly of limpid or col…

Either one of the two forms of a dimorphous substance; as, calcite and aragonite are dimorphs.

zation in two independent forms of the same chemical compound, as of calcium carbonate as calcite and aragonite.

Capable of being disintegrated, or reduced to fragments or powder. Argillo-calcite is readily disintegrable by exposure. Kirwan.

tions resembling teeth; -- also called tooth ornament. Dogtooth spar (Min.), a variety of calcite, in acute crystals, resembling the tooth of a dog. See Calcite. -- Dogtooth violet (Bot.), a small, bulbous herb of the Lily family (genus Erythronium). It has two shining flat leaves and commonly one large flower. [Writt…