Arsenic Sulfide
AsS
|
Chemical name
Arsenic Sulfide |
|
Mineral name
Realgar |
|
Chemical formula
AsS |
|
Crystal system
monoclinic |
|
Crystal Class
Prismatic (2/m) |
|
Space Group
P21/n (no. 14) |
|
Unit cell
a [Å]:9.325(3) b [Å]:13.571(5) c [Å]:6.587(3) |
|
Formula units
Z = 16 |
|
Twinning
Contact twins on {100} |
|
Mohs hardness
1,5-2 |
|
Density [g/cm3]
3.5 |
|
Cleavage
Good on {010};
less so on {101}, {100}, {120}, and {110} |
|
Fracture / Tenacity
Sectile, slightly brittle |
|
Streak
Reddish brown |
|
Transparency
Transparent |
|
Luster
Resinous to greasy |
|
Optical character
Biaxial (-) |
|
Refractive Index
nα = 2.538
nβ = 2.684
nΥ = 2.704 |
