General Information:
Chemical Formula:
Ca2Mg11(CO3)9(HCO3)4(OH)4·6(H2O)
Composition:
(Molecular Weight = 1,307.78 gm)
Calcium 6.13 % Ca
Magnesium 20.44 % Mg
Hydrogen 1.54 % H
Carbon 11.94 % C
Oxygen 59.95 % O
Empirical Formula:
Ca2Mg11(CO3)9(HCO3)4(OH)4·6(H2O)
Environment:
Weathering product of pyroxene-garnet skarn.
IMA Status:
Approved IMA 1980
Locality:
Tyrnyauz, Caucasus, Russia.
Name Origin:
Named for Evengi M. Sergeev (1914-), engineering geologist, Moscow University.
Physical Properties:
Cleavage:
None
Color:
white.
Density:
2.2 - 2.35, Average = 2.27
Habits:
Aggregates - Made of numerous individual crystals or clusters., ,
Hardness:
3.5 - Copper Penny
Luster:
Earthy (Dull)
Streak:
white
More details...