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Gemstone Crystal System Density Hardness Refractive index Treatments
Chrysoprase micrcrystalline 2.65 7.0 1.564-1.660 dying



chrysprase rough and cut

Color:
Vibrant pastel green color

Clarity: Semi-transparent to Translucent
Optic Character:
AGG
Cause of Color: Ni rarely Cr
Fluorescence: Generally Inert
Fracture : Concoidal

Luster : Vitreous
Cleavage :
None
Durability: Cood

Characteristics for Identification:
Nickel rich clay inclusions

Localities:
Southern regions of Australia

Quartz Family:

Amethyst
Citrine
Ametrine
Rutilated Quartz
Smokey Quartz
Rose Quartz
Dendritic Quartz
Tourmalinated Quartz
Phantom Quartz

Microcrystalline
Quartz
:

Agate
Chrysoprase
Jasper
Carnelian
Bloodstone
Onyx

 

 

Chrysoprase

SiO2 (Silicon Dioxide)

Chysoprase is a variety of microcrystalline silicon dioxide colored with nickel. It has been historically renowned for having some incredible powers. In the Middle Ages it was believed that if you put a piece of chrysoprase in your mouth, you would become invisible. It was thought that the stone would lose its color in the presence of poison. Romanian folklore claims that chrysoprase enabled its owner to understand the language of lizards, although I've never known lizards to be terribly chatty. Today chrysoprase is appreciated as a calming stone of the heart.

Chrysoprase is formed by the weathering of serpentine . As the elements break down the serpentine, nickel, silica and other iron oxides are dissolved out of the stone and collect in cracks, crevices and saprolite (a soft, rich clay) in the underlying environment.

Exceptional material is found in the Yerilla mines, which have just recently reopened. The majority of the Australian Chrysoprase comes from central Queensland. The Yerilla mines are in the West and substantial deposits are also mined in the Southern region. While Australia's vast supplies of the gemstone have helped to bring prices down world-wide, the mines are still careful not to flood the market and maintain some control over pricing.