Prasiolite, green-quartz or vermarine is a green form of quartz, a silicate mineral chemically silicon dioxide. Prasiolite is one of several quartz varieties. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, but it is also seen in Lower Silesia in Poland. Naturally occurring prasiolite is also found in the Thunder Bay area of Canada.
It is a rare stone in nature. Most prasiolite sold is heat treated amethyst, Most amethyst will turn yellow or orange when heated producing citrine. But some amethyst will turn green when treated. Currently most all prasiolite on the market results from a combination of heat treatment and ionizing radiation.
Green quartz is sometimes incorrectly called green amethyst, which is an actual misnomer and not an acceptable name for the material, the proper terminology being Prasiolite.
Stock Sizes: Available in faceted and checkerboard cut
Rounds: 2mm – 20mm
Oval: 4x3mm – 25x18mm
Pear: 6x4mm – 30x15mm
Marquise: 4x2mm – 30x12mm
Octagonal: 6x4mm – 25x18mm
Trillion: 4mm – 20mm
Heart: 5mm – 20mm
Square: 3mm – 15mm
Princess Cut: 4mm – 10mm
Baguette: 6x3mm – 25x12mm
Cushion: 5x5mm – 20x20mm + 10x8mm – 20x15mm
Chemical Formula: SiO2 Silicon Dioxide
Crystal Structure: Trigonal; Hexagonal Prisms
Colour: Pale green
Hardness: 7 on Moh`s scale
Refractive Index: 1.544 to 1.553
Specific Gravity: 2.66
Treatments: Green quartz is typically a heated form of Quartz.
Care: Quartz can be safely cleaned with warm soapy water. Ultrasonic cleaners are usually safe except in the rare instances where a stone is dyed or treated by fracture filling. Steam cleaning is not recommended, and Quartz should not be subjected to heat. Bright sunlight can cause Green Quartz to fade.