Mohs Hardness: 7 out of 10
Color: Green to yellowish green, usually light in tone and saturation.
RI: 1.544 to 1.553 (very constant)
Optic Character: Uniaxial positive. Might show a bull's eye or Airy's spiral optic figure and Brazil law twinning under crossed polarizing filters.
Pleochroism: Weak to moderate purple and reddish purple
Spectrum: Not diagnostic
Fluorescence: Generally inert.
SG: 2.66 (+0.03 / -0.02)