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| Category | Sulfide mineral |
|---|---|
| Formula (repeating unit) |
Mercury(II) sulfide, HgS |
| Strunz classification | 2.CD.15a |
| Crystal system | Trigonal |
| Crystal class | Trapezohedral (32) (same H–M symbol) |
| Space group | P3121, P3221 |
| Unit cell | a = 4.145(2) Å, c = 9.496(2) Å, Z = 3 |
Formula:
HgS
Colour:
Tint or shade of red; cochineal red, brownish red
Lustre:
Metallic
Hardness:
2 – 2½
Specific Gravity:
8.176
Crystal System:
Trigonal
Name:
From Persian “zinjifrah”; original meaning lost (dragon’s blood?).
Polymorph of:
The α phase of HgS. Trimorphous with metacinnabar (the β phase) and hypercinnabar.
Visit gemdat.org for gemological information about Cinnabar.
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