Chrysoprase or chrysophrase is a precious stone range of chalcedony (gristly type of quartz) that includes minute proportions of nickel. Its shade is in general apple-green, but ranges to profound green. The darker variants of Chrysoprase are also compared to as prase. (However, the word prase is also utilized to portray green quartz, and to a positive extent is a color-descriptor, relatively than a scrupulously distinct mineral variant.)
Chrysoprase is a form of cryptocrystalline, which states that it is self-possessed of crystals that they can never be witnessed as distinctive particles under regular intensification. These reasons plants itself spaced out from the likes of rock crystal, amethyst, citrine, and the other supplementary varieties of crystalline quartz which are essentially transparent and fashioned from effortlessly renowned 6-sided crystals. Further members of the cryptocrystalline quartz family consist of agate, carnelian, and onyx. Contrasting many non-transparent units of the quartz kin, it is the color of Chrysoprase, relatively than any blueprint of markings that makes it sought-after. The word Chrysoprase is erected from the Greek chrysos explained as 'gold' and prason, termed as 'leek'. Contrasting to emerald which shells its green shade to the occurrence of chromium, the color of Chrysoprase is owed to mark out quantities of nickel in the compos.The nickel seemingly appears as platelets of the talc-like stone willemsite.