Mineral Information and Data:

Vyalsovite
CaFeAlS(OH)5 [CNMNC approved formula]

Named for Leonid N. Vyalsov (1939-), Russian mineralogist.

IMA status : Approved Species 1990 ()
CLASSIFICATION 
Dana
(8th edition) :
02.14.04.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.14) (Hydroxyl or Hydrated)
  (02.14.04)
  
Nickel-Strunz
(10th edition) :
02.FD.45
  (02) Sulfides
  (02.F) Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  (02.FD) With O, OH, H2O
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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