Mohs Hardness: 7 out of 10
Color: Green, with aventurescence
RI: 1.544 to 1.553 (very constant)
Birefringence: Usually not detectable
Optic Character: Uniaxial positive. Might show a bull's eye or Airy's spiral optic figure and Brazil law twinning under crossed polarizing filters.
Spectrum: Bands around 649nm & 682nm
Fluorescence: Inert to weak grayish green or reddish under LW and SW
SG: 2.66 (+0.03 / -0.02)