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 |