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
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