General Information:
Chemical Formula:
Ca4Nb6Si5O24(OH)10·5(H2O)
Composition:
(Molecular Weight = 1,332.24 gm)
Calcium 12.03 % Ca
Niobium 41.84 % Nb
Silicon 10.54 % Si
Hydrogen 0.76 % H
Oxygen 34.83 % O
Empirical Formula:
Ca4Nb6Si5O24·5(H2O)
Environment:
Agpaitic pegmatites in alkalic granite.
IMA Status:
Approved IMA
Locality:
Khan-Bogdinsky massif, Gobi desert, Mongolia, China.
Name Origin:
Named after the locality.
Physical Properties:
Cleavage:
[001] Good
Color:
gray lilac or light violet.
Density:
3.147 - 3.15, Average = 3.14
Diaphaniety:
Transparent
Habits:
Microscopic Crystals - Crystals visible only with microscopes., Foliated - Two dimensional platy forms.,
Hardness:
2 - Gypsum
Luster:
Silky
Streak:
white
More details...