Vishnevite

General Information:
 Chemical Formula:
(Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O)
Physical Properties:
 Cleavage:
[1010] Perfect, [0001] Indistinct
 Color:
colorless, yellow, white, light blue, or light gray.
 Density:
2.32 - 2.42, Average = 2.37
 Diaphaniety:
Transparent to Translucent
 Hardness:
5-6 - Between Apatite and Orthoclase
 Luster:
Vitreous - Pearly
 Streak:
white
More details...