Mineral phase
- IMA name
- Cinnabar
- Secondary names
- Cinabre
- CAS number
- 1344-48-5
- Class
- non-silicate mineral
- Compound type
- sulfide
- Formula
- α−HgS
- Chemical formula
- HgS
- Elemental formula
- Hg S
- Isotope mixture type
- terrestrial abundance
Strunz
- Class
- sulfides - sufosalts (02)
- Division
- metal sulfides, M:S = 1:1 (and similar) (02.C)
- Family
- With Sn, Pb, Hg, etc. (02.CD)
- Code
- 02.CD.15a
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
- -Cinnabar- group (02.08.14)
- Code
- 02.08.14.01
- Phase type
- crystalline
- Crystal system
- trigonal
- Crystal class
- trapezohedral
- Crystal class symbol
- 32 (D3)
- Crystal spacegroup
- P3(1)21
- Molar mass
- 232.66 g/mol
- Density
- 8.1 g/cm3
- State NTP
- solid
- Phase transitions
-
Phase transition type Other phases Temperature - Pressure solid-solid Metacinnabar below 617K (344°C) at 1 bar
- Refringence type
- uniaxial
- Refringence sign
- positive
- Birefringence
- 0.351
- Refraction index no (w)
- 2.905
- Refraction index ne (e)
- 3.256
- Pure color
- red
- Color
- lead gray, brown, brown pink, vermilion, gray
- Diaphaneity
- translucent to opaque
- Luster
- adamantine