Vishnevite
(repeating unit)(Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·nH2O IMA symbol Vhn[1] Strunz classification 9.FB.05 Crystal system Hexagonal Crystal class Pyramidal (6)
H-M symbol: (6) Space group P63 Unit cell a = 12.7228(3)
c = 5.198(3) [Å]; Z = 1 Identification Color Colorless, light blue, orange-yellow, white Cleavage Perfect Mohs scale hardness 5 - 6 Luster Vitreous, pearly Streak White Optical properties Uniaxial (-) Refractive index nω = 1.490 - 1.507 nε = 1.488 - 1.495 Birefringence δ = 0.002 - 0.012
H-M symbol: (6)
c = 5.198(3) [Å]; Z = 1
Vishnevite, or sulfatic cancrinite, is a mineral of the cancrinite group with the chemical formula (Na, Ca, K)6(Si, Al)12O24[(SO4),(CO3), Cl2]2-4·nH2O. It has hexagonal crystals.[2][3]
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