Mecury Sulfide
HgS
Chemical name
Mecury Sulfide
Mineral name
Cinnabarite
Chemical formula
HgS
Melting point [°C]
580
Crystal system
trigonal
Crystal Class
trigonal-trapezohedral (32)
Space Group
P3_1 21
Unit cell
a [Å]:4.15
b [Å]:4.15
c [Å]:3.26
Molecular weight [g/mol]
232,66
Formula units
Z=3
Frequent crystal surfaces
{0001}, {10-11}
Twinning
contact and penetration twins on {0001}
Mohs hardness
2 - 2.5
Density [g/cm3]
8.18
Cleavage
perfect on {10-10}, prismatic
Fracture / Tenacity
brittle, sectile, conchoidal to uneven
Color
red to brownish red, lead-gray
Streak
scarlet
Transparency
transparent in thin flakes
Optical character
uniaxial (+)
Refractive Index
nω=2.905; nε=3.256
Birefringence δ
0.351