Zirconium Silicate
ZrSiO4
|
Chemical name
Zirconium Silicate |
|
Mineral name
Zircon |
|
Chemical formula
ZrSiO4 |
|
Melting point [°C]
2550 |
|
Crystal system
tetragonal |
|
Crystal Class
ditetragonal-dipyramidal (4/m 2/m 2/m) |
|
Space Group
I4_1/amd |
|
Unit cell
a [Å]:6.59 b [Å]:6.59 c [Å]:5.94 |
|
Molecular weight [g/mol]
183,29 |
|
Formula units
Z=4 |
|
Frequent crystal surfaces
{100}, {110}, {101} |
|
Twinning
on {101}; polysynthetic twins on {112} (shocked crystals by meteorite impact) |
|
Mohs hardness
7.5 |
|
Density [g/cm3]
4.67 |
|
Cleavage
perfect on {110} and {111} |
|
Fracture / Tenacity
conchoidal to uneven |
|
Color
reddish-brown, yellow, blue, green, gray, colorless |
|
Streak
white |
|
Transparency
transparent to opaque |
|
Luster
vitreous to adamantine |
|
Optical character
uniaxial (+) |
|
Refractive Index
nω=1.925-1.961; nε=1.980-2.015 |
|
Birefringence δ
0.047 - 0.055 |
|
Pleochroism δ
weak |
|
Other
radioactive, fluorescent |
