General Information:
Chemical Formula:
Na6Ca2Al6Si6O24(CO3)2
Composition:
(Molecular Weight = 1,052.50 gm)
Sodium 13.11 % Na
Calcium 7.62 % Ca
Aluminum 15.38 % Al
Silicon 16.01 % Si
Carbon 2.28 % C
Oxygen 45.60 % O
Empirical Formula:
Na6Ca2Al6Si6O24(CO3)2
Environment:
Alteration of nepheline in igneous rocks.
Locality:
Tunkinsk Mountains, west of Irkutsk in Siberia.
Name Origin:
Named after the Russian minister, E. F. Kankrin (1774-1845).
Physical Properties:
Cleavage:
[1010] Perfect
Color:
blue, colorless, gray green, yellow, or white.
Density:
2.4 - 2.5, Average = 2.45
Diaphaniety:
Transparent to translucent
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
6 - Orthoclase
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
white
More details...