Solid phase
- Official name
- mercury(II) sulfide beta
- Secondary names
- Metacinnabar; alpha-HgS; mercury sulfide; mercury sulphide; black Cinnabar
- CAS number
- 23333-45-1
- Family
- covalent network solid
- Class
- tridimentional covalent network solid
- Compound type
- non-oxide ceramic
- Formula
- $\beta-HgS$
- Chemical formula
- HgS
- Elemental formula
- Hg S
- Isotope mixture type
- terrestrial abundance
- Class
- tridimensional covalent networks (11)
- Type
- metal homonuclear tridimensional networks (elemental) (11.02)
- Equivalent mineral
- Metacinnabar
- Phase name
- $\beta-HgS$
- Phase type
- crystalline
- Crystal system
- isometric (cubic)
- Crystal class
- hextetrahedral
- Crystal class symbol
- -43m (Td)
- Crystal spacegroup
- F-43m
- Comments
- There are three $HgS$ crystalline phases: $\alpha-HgS$, $\beta-HgS$, $\gamma-HgS$ and an amorphous one $\alpha'-HgS$
- 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 $\alpha-HgS$ above 617K (344°C) at 1 bar
- Refringence type
- isotropic
- Refringence sign
- no
- Color
- grayish black
- Diaphaneity
- opaque
- Luster
- metallic