Color: Chrome green to colorless.
Moh’s Hardness: 5-6
Refractive Index: 1.671-1.726
Critical Angle: 36.78°
Specific Gravity: 3.27-3.31
Heat Sensitivity: Yes in my experience
Birefringence (double refraction): Medium (.028)
Crystal Structure: Monoclinic
Treatments: Generally none
What I prefer to polishing with: Alumina or cerium oxide on most standard polishing laps or chrome oxide Ultralap.
Jeff’s Comments: Cuts and polishes pretty easily, can be a little tough to polish sometimes. It seems to grab diamonds and can scratch. Watch the heat when dopping. Orient stone to avoid cleavage plane. Use an extra-fine lap for pre-polishing.
Design Notes: About any designs will work well… I like shallow checker designs because the color is usually on the saturated side
Design Links: Brilliant Pear – This is great for clear rough if you have a piece that will work…