General Information:
Chemical Formula:Na6Ca2Al6Si6O24(CO3)2
Composition:(Molecular Weight = 1,052.50 gm)Sodium 13.11 %
NaCalcium 7.62 %
CaAluminum 15.38 %
AlSilicon 16.01 %
SiCarbon 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
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