Mohs Hardness: 6.5 to 7.5 out of 10
Color: Dark reddish purple to purplish red. Rhodolite must have a purple component.
RI: 1.750 to 1.780
SR/DR/AGG: SR, often with ADR
Spectrum: 3 strong bands in the green and yellow at 505, 527 & 575nm
SG: 3.84 (+/- 0.10)