Color Change Amethyst to Gray

CHEMICAL PROPERTIES:

HARDNESS (Mohs’s Scale): 8.50
DENSITY: 5.65 – 5.95
REFRACTIVE INDEX: 2.088 – 2.176
DISPERSION: 0.058 – 0.066
HEAT RESISTANCE: 650°C – 700°C
FRACTURE: Conchoidal
SPECIFIC GRAVITY: 5.65-5.95,
SHOCK RESISTANCE: 350°