Traduire Alstonite en Anglais

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Langue d'origine

Langue désirée

see under bromlife

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(CO3)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 T. Thomson in 1837, and alstonite by August Breithaupt of the Freiberg Mining Academy in 1841. Both of these names, derived from the locality, have been in common use.

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General Information:
 Chemical Formula:
(Molecular Weight = 297.42 gm)
Barium 46.17 % Ba
Calcium 13.48 % Ca
Carbon 8.08 % C 
Oxygen 32.28 % O 
 Empirical Formula:
Low-temperature hydrothermal deposits. See other trimorphs paralstonite and barytocalcite.
Brownley Hill lead mine, Alston, Cumberland and Fallowfield lead mine hear Hexham, Northcumberland, England.
 Name Origin:
Named after the locality.
Physical Properties:
[110] Imperfect
colorless, gray, white, or pink.
3.69 - 3.71, Average = 3.7
Transparent to translucent
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Pseudo Hexagonal - Crystals show a hexagonal outline.,
4-4.5 - Between Fluorite and Apatite
Fluorescent, Long UV=weak yellow.
Vitreous (Glassy)
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