Mineral Information and Data:

Calomel
HgCl [CNMNC approved formula]

Named From the Greek, kalos - "beautiful" and melas - "black.".

IMA status : Valid species (Pre-IMA 1776) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
09.01.08.01  
  (09) Anhydrous and Hydrated Halides
  (09.01) where A X
  (09.01.08) Calomel Group
  
Nickel-Strunz
(10th edition) :
03.AA.30
  (03) Halides
  (03.A) Simple Halides, Without H2O
  (03.AA) M:X = 1:1, 2:3, 3:5, etc.
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
  
  
  

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