ZrSiO4Tetragonal
Zircon
ZrSiO4
SilicatesChemical FormulaZrSiO4
Crystal SystemTetragonal
Mohs Hardness7.5
Specific Gravity4.68
ColorBrown, red, yellow, green, blue, colorless
LusterAdamantine to vitreous
StreakWhite
CleavageNone
FractureConchoidal to uneven
Occurrence
Found in igneous and metamorphic rocks. Used for U-Pb dating. Oldest known Earth mineral.