Mineral Information and Data:

Vishnevite
Na8(AlSiO4)6O24(SO4) • 2H2O [CNMNC approved formula]

Named for the locality in the Vishnevy Mountains, Russia.

IMA status : Valid species (Pre-IMA 1931) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
76.02.05.15  
  (76) Tectosilicate Al-Si Framework
  (76.02) Feldspathoids and related species
  (76.02.05) Cancrinite group
  
Nickel-Strunz
(10th edition) :
09.FB.05
  (09) Silicates
  (09.F) Tektosilicates without Zeolitic H2O
  (09.FB) Tektosilicates with additional anions
  
Crystal system: Hexagonal System
Point group (H-M): 622 — trapezoidal
Space group: P63
Unit cell: a = 12.685(6)Å, c = 5.179(1) Å, Z=1
Crystal Habit: As prismatic crystals and irregular granular masses.
  
Color: Pale lilac, light blue to dark gray
Diaphaneity: Transparent to translucent
Hardness (Mohs): 5 - 6
Measured Density: 2.32 - 2.42 g/cm3
Cleavage: Perfect on {1010}, poor on {0001}
  
Geologic Setting: In poikilitic aegirine-nepheline-sodalite syenites and associated pegmatites.
Mineral Association: Aegirine, nepheline, cancrinite, sodalite, scolecite
  

 

Vishnevite
Origin: Vishnevye Gory, Urals, Russia (type locality)
Sample size: 6 x 5 x 5 cm
Photo: Tom Loomis

 

Vishnevite
(zoom-in of above)

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