Mineral Information and Data:

Coccinite
HgI2 [CNMNC approved formula]

Named Unknown.

IMA status : Valid species (Pre-IMA 1845) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
09.02.07.03  
  (09) Anhydrous and Hydrated Halides
  (09.02) where A (X)2
  (09.02.07)
  
Nickel-Strunz
(10th edition) :
03.AB.10
  (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
  
  
  

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