General Information:
Chemical Formula:
BaCa(CO3)2
Composition:
(Molecular Weight = 297.42 gm)
Barium 46.17 % Ba
Calcium 13.48 % Ca
Carbon 8.08 % C
Oxygen 32.28 % O
Empirical Formula:
BaCa(CO3)2
Environment:
Low-temperature hydrothermal deposits. See other trimorphs paralstonite and barytocalcite.
Locality:
Brownley Hill lead mine, Alston, Cumberland and Fallowfield lead mine hear Hexham, Northcumberland, England.
Name Origin:
Named after the locality.
Physical Properties:
Cleavage:
[110] Imperfect
Color:
colorless, gray, white, or pink.
Density:
3.69 - 3.71, Average = 3.7
Diaphaniety:
Transparent to translucent
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Pseudo Hexagonal - Crystals show a hexagonal outline.,
Hardness:
4-4.5 - Between Fluorite and Apatite
Luminescence:
Fluorescent, Long UV=weak yellow.
Luster:
Vitreous (Glassy)
Streak:
white
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