Mohs Hardness: 5.5 to 6 out of 10
Color: Typically a deep blue hue, but can also occur in gray, yellow, orange or pink.
RI: 1.483 (+/-0.004)
Spectrum: Usually not diagnostic
Fluorescence: Might fluoresce patchy orange or red under LW and SW.
Routine Treatments: None
Additional Enhancements: Heating, irradiation