calcite
方解石,长石,方晶石,方石英
Definitions
- 1
- : one of the commonest minerals, calcium carbonate, CaCO3, found in a great variety of crystalline forms: a major constituent of limestone, marble, and chalk; calc-spar.
Examples
Excavated calcite crystals hadn’t been modified in any way and had no apparent practical use, raising the possibility that these items held ritual or symbolic significance, Wilkins suspects.
As water flows through a limestone cave, it leaves behind small deposits of minerals, which gradually build up into layers of calcite, like the one atop the pig painting.
Further chemical, X-ray and microscopic examinations revealed a thin layer of calcite containing high levels of magnesium.
Her bones stick up from the ground, and water has sealed them with a sparkling calcite coating.
Aragonite, a mineral formed of calcium carbonate crystallized in the rhombic system; specific gravity 2.94 (compare Calcite).
Sandstone mortar, eye in green glaze , the other objects as in N. 1, but with the addition of tablets of calcite and lead.
In the first class 74 are included sulphur and ammonium nitrate; monotropy is exhibited by aragonite and calcite.
The emerald occurs in nests of calcite in a black bituminous limestone containing ammonites of Lower Cretaceous age.
These cave formations are all composed of the mineral calcite, which forms all lime rock.