SiO2 (Fe bearing)Trigonal
Citrine
SiO2 (Fe bearing)
SilicatesChemical FormulaSiO2 (Fe bearing)
Crystal SystemTrigonal
Mohs Hardness7
Specific Gravity2.65
ColorYellow to orange
LusterVitreous
StreakWhite
CleavageNone
FractureConchoidal
Occurrence
Yellow variety of quartz. Often created by heat-treating amethyst.