Prasiolite

Commonly Understood as Green Amethyst. Prasiolite (Greek- Leek green stone) is not found in nature. It is produced in labs, by heating violet amethyst or yellowish quarts from the deposit of Montezuma in Minas Gerais, Brazil

It need to be heated at about 930 degrees F(500 degrees C). Other deposits of heatable amethyst have been reported in Arizona. In sunlight, color commonly fades. 

CHEMICAL COMPOSITION:  SiO2 silicon dioxide

CUT: Baguette, Cushion, Emerald, Heart, Marquise, Oval, Pear, Round, Square, Triangle, Trillion

SPECIFIC GRAVITY: 2.63 – 2.65

REFRACTIVE INDEX: 1.54 – 1.553

MOHS' HARDNESS: 7

CLEAVAGE: NONE

DISPERSION: 0.013

TRANSPARENCY : TRANSPARENT