Mineral phase
IMA name
Metacinnabar
CAS number
23333-45-1
Type
Class
non-silicate mineral
Compound type
sulfide
Chemical composition
Formula
$\beta-HgS$
Chemical formula
HgS
Elemental formula
Hg S
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Hg$ Mercury element 1 constituent element main
$S$ Sulfur element 1 constituent element main

Strunz

Class
sulfides - sufosalts (02)
Division
metal sulfides, M:S = 1:1 (and similar) (02.C)
Family
With Zn, Fe, Cu, Ag, Au, etc. (02.CB)
Code
02.CB.05a

Dana

Major class
sulfides (II)
Class
sulfides - including selenides and tellurides (02)
Type
where Am Bn Xp, with m:p=1:1 (02.08)
Group
Sphalerite group (Isometric: F4-3m) (02.08.02)
Code
02.08.02.03
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
hextetrahedral
Crystal class symbol
-43m (Td)
Crystal spacegroup
F-43m
Molar mass
232.66 $g/mol$
Density
7.7 - 7.8 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid Cinnabar below 617K (344°C) at 1 bar
Refringence type
isotropic
Refringence sign
no
Birefringence
0
Color
grayish white, grayish black
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