Arsen Sulfide
As2S3
|
Chemical name
Arsen Sulfide |
|
Mineral name
Orpiment |
|
Chemical formula
As2S3 |
|
Melting point [°C]
300 - 325 |
|
Crystal system
monoclinic |
|
Crystal Class
monoclinic-prismatic (2/m) |
|
Space Group
P2_1/n |
|
Unit cell
a [Å]:11.48 b [Å]:9.58 c [Å]:4.26 |
|
Molecular weight [g/mol]
246,06 |
|
Formula units
Z=4 |
|
Frequent crystal surfaces
{100}, {010}, {301}, {110}, {011}, {210} |
|
Mohs hardness
1.5 - 2 |
|
Density [g/cm3]
3.49 |
|
Cleavage
perfect on {010}, imperfect on {100} |
|
Fracture / Tenacity
sectile |
|
Color
yellow to golden or brownish-yellow |
|
Streak
pale lemon-yellow |
|
Transparency
transparent |
|
Luster
resinous, pearly on cleavage surfaces |
|
Optical character
biaxial (-) |
|
Refractive Index
nα=2.400; nβ=2.810; nΥ=3.020 |
|
Birefringence δ
0.620 |
|
Pleochroism δ
strong |
|
Piezoelectric crystals
|
|
T(c) [°C]
nω = 1.564–1.595, |
