Luster
Pleochroism
Dispersion
Transparency
Refractive Index
Optic Character
Crystal System
Birefringence
Clarity
Weak: pink pale pinkHerve Nicolas Lazzarelli
Transparent, Translucent, Transparent to translucent
TranslucentHerve Nicolas Lazzarelli
Strong: X = pale emerald green or colourless; Y = dark emerald green or pale blue; Z = dark emerald green or pale blue