Cinnabar
Refractive Index low
ne 3,256 - 3,256
Refractive Index high
no 2,905 - 2,905
Birefringence
0.351 - 0.351
Density
8.09 - 8.10
Polariscope
1 positive
Colours:
brown, red, black
Transparency:
Transparent, Translucent, Opaque
Remarks:
no remark
Hardness:
2 - 3
Formula:
HgS
System:
Trigonal
Rare?
5