Chrysoprase
The chrysoprase is a variety of Gemme of Calcédoine (a type of quartz fibrous) but which contains Nickel. It is generally of pale color green, but can also be green dark. It is made crystals so small that one cannot see them with the magnifying glass. This characteristic differentiates it from the Améthyste, the Citrine, and the other quartz shapes which are more or less transparent and form hexagonal crystals. One counts among the other varieties of quartz the Agate, the Carnelien and the onyx. It is for its color that she is sought and not for its forms.
The word chrysoprase comes from the Greek chrysos , but, and prason , leek.
Because of the shortage of chrysoprase, and with its color pleasant green, chrysoprase is a type of very required quartz. The purest gems are comparable with the Jade, with which one confuses it sometimes. Crossed in Cabochon S it is as required as amethyst.
Chrysoprase owes its color with the Nickel in its structure, different from the emerald which owes its beautiful green color with the Chrome. Serpentinite S gold other Ultramafic Ophiolite rock'n'rolls. In the Australian deposits, chrysoprase occurs ace veins and nodules with brown Goethite and other Oxide iron S in the Magnesite - rich Saprolite below year iron and silica course. -->
Like all quartz shapes, chrysoprase has a hardness of 6 - 7, and is fractured like the Silex.
Best the sources of chrysoprase are the Queensland, the West of the Australia, the Germany, the Poland, the Russia, the Arizona, the California, and the Brésil.
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