Reflected/Transmitted light color: colorless, pale brwon, pale purplish brown, pale greenish brown or pale green

Pleochroism: more strongly coloured varieties show weak to moderate pleochroism, titanium-augite moderate to strong, α pale greenish, pale brownish, green, greenish yellow, β pale brown, pale yellow-green, violet, γ pale green, grayish green, violet

Optical isotropy/anisotropy: biaxial

Optical sign: +

Refractive indices: α = 1. 671-1.735, β = 1.672-1.741, γ 1.703-1.774

Birefringence δ: 0.018-0.033

2V angle: 25-61°