Mineral Information and Data:

Sellaite
MgF2 [CNMNC approved formula]

Named for Quintino Sella (1827-1884), Italian mining engineer and mineralogist.

IMA status : Valid species (Pre-IMA 1868) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
09.02.02.01  
  (09) Anhydrous and Hydrated Halides
  (09.02) where A (X)2
  (09.02.02)
  
Nickel-Strunz
(10th edition) :
03.AB.15
  (03) Halides
  (03.A) Simple Halides, Without H2O
  (03.AB) M:X = 1:2
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
  
  
  
Other Properties: H2O Soluble. Gemstone Rare.

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