Silicon Dioxide Iron Chromium doped
SiO2:FeCr
|
Chemical name
Silicon Dioxide Iron Chromium doped |
|
Mineral name
Quartz |
|
Chemical formula
SiO2:FeCr |
|
Melting point [°C]
1700 |
|
Crystal system
trigonal |
|
Crystal Class
trigonal-trapezohedral (32) |
|
Space Group
P3_1 21, P3_2 21 |
|
Unit cell
a [Å]:4.91 b [Å]:4.91 c [Å]:5.40 |
|
Molecular weight [g/mol]
60.08 |
|
Formula units
Z=3 |
|
Frequent crystal surfaces
{10-11}, {01-11}, {10-10} |
|
Twinning
dauphine law, brazil law, japan law |
|
Mohs hardness
7 |
|
Density [g/cm3]
2.65 |
|
Cleavage
none |
|
Fracture / Tenacity
brittle, conchoidal |
|
Color
dark brown |
|
Streak
white |
|
Transparency
transparent to opaque |
|
Luster
vitreous on prismatic surfaces, resinous on fracture planes |
|
Optical character
uniaxial (+) |
|
Refractive Index
nω=1.543; nε=1.552 |
|
Birefringence δ
0.009 |
|
Pleochroism δ
none |
