Barium Sulfate
BaSO4
|
Chemical name
Barium Sulfate |
|
Mineral name
Baryte |
|
Chemical formula
BaSO4 |
|
Melting point [°C]
1580 |
|
Crystal system
orthorhombic |
|
Crystal Class
orthorhombic-dipyramidal (2/m 2/m 2/m) |
|
Space Group
Pnma |
|
Unit cell
a [Å]:8.88 b [Å]:5.46 c [Å]:7.16 |
|
Molecular weight [g/mol]
233,38 |
|
Formula units
Z=4 |
|
Mohs hardness
3 - 3.5 |
|
Density [g/cm3]
4.48 |
|
Cleavage
perfect on {001} and {210}, imperfect on {010} |
|
Fracture / Tenacity
brittle, uneven |
|
Color
colorless, white, light blue shaded, yellow, gray, brown |
|
Streak
white |
|
Transparency
transparent to opaque |
|
Luster
vitreous, pearly |
|
Optical character
biaxial (+) |
|
Refractive Index
nα=1.634-1.637; nβ=1.636-1.638; nΥ=1.646-1.648 |
|
Birefringence δ
0.012 |
|
Pleochroism δ
colorless |
|
Other
fluorescent, phosphorescent |
