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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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