calcite$10683$ - ترجمة إلى اليونانية
CARBONATE MINERAL
Baryto-Calcite; Bromlite; Baryto-calcite
![type locality]] in Cumbria (size: 5.1 × 4.1 × 2.7 cm)](https://commons.wikimedia.org/wiki/Special:FilePath/Alstonite-mrz258a.jpg?width=200 "type locality]] in Cumbria (size: 5.1 × 4.1 × 2.7 cm)")
calcite
n. ασβεστίτης
تعريف
Calcite
·noun 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.
ويكيبيديا
Alstonite
Alstonite, also known as bromlite, is a low temperature hydrothermal mineral that is a rare double carbonate of calcium and barium with the formula BaCa(CO
3)
2, sometimes with some strontium. Barytocalcite and paralstonite have the same formula but different structures, so these three minerals are said to be trimorphous. Alstonite is triclinic but barytocalcite is monoclinic and paralstonite is trigonal. The species was named Bromlite by Thomas Thomson in 1837 after the Bromley-Hill mine, and alstonite by August Breithaupt of the Freiberg Mining Academy in 1841, after Alston, Cumbria, the base of operations of the mineral dealer from whom the first samples were obtained by Thomson in 1834. Both of these names have been in common use.
