Chrysoprase


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chrysoprase

[′kris·ə‚prāz]
(mineralogy)
An apple-green variety of chalcedony that contains nickel; used as a gem. Also known as green chalcedony.

Chrysoprase

 

a mineral; a green variety of chalcedony (see), with the color ranging from emerald green to grass and apple green, caused by microinclusions of nickel silicates. Chrysoprase has a vitreous or greasy luster. It is translucent and sometimes opalescent. In large segregations the degree of translucence and intensity of color varies. Chrysoprase occurs in the form of veins and veinlets in the weathering crust of ultrabasic rocks. Its formation is believed to be caused by hypergenic processes of chemical weathering of dunites and serpentinites or with the hydrothermal alteration of these rocks.

Chrysoprase is an attractive gem and semiprecious stone. It has been known and mined in Europe since the 14th century and was extensively used in the 17th and 18th centuries to make jewelry, church utensils, Florentine mosaics, and inlays. The largest deposit now being worked is at Marlborough in Australia; other deposits are found in Poland, the United States, and Brazil. In the USSR chrysoprase occurs in the Urals and in Kazakhstan.

chrysoprase

put in mouth, renders bearer invisible. [Gem Symbolism: Kunz, 67–68]
References in periodicals archive ?
The high Ni content of this strongly coloured prase opal appears to be consistent with the notion that chrysoprase with a lower degree of crystallinity tends to have greater amounts of Ni and a more intense colour (cf.
Chrysoprase and prase opal from Haneti, central Tanzania.
XRD and IR spectroscopic investigations of some chrysoprases.
For instance, the state of Minas Gerais in Brazil is famous for amethyst, rock crystal, citrine, and rose quartz; the European Alps are noted for rock crystal, milky quartz, and smoky quartz; Romania and Czechoslovakia are good sources of rock crystal and amethyst; the best chrysoprase is from Australia; and parts of the United States are important sources of rock crystal, rose quartz, and smoky quartz.
Chrysoprase brooch Chrysoprase is a variety of chalcedony, a type of quartz, the green colour deriving from nickel, an unusual feature as the green in most stones derives from iron, chromium or vanadium.
In the 18th century a deposit of good quality chrysoprase was discovered in Silesia (western Poland).
Chrysoprase was also popular in Victorian times, its hardness making it ideal for carving into cameos and intaglios, as well as for beads and cabochons, the Victorian jewellers making use of the Silesian material.
January - garnet or rose quarter February - amethyst or onyx March - aquamarine or bloodstone April - diamond or rock crystal May - emerald or chrysoprase June - alexadrite or moonstone or pearl July - ruby or carmelion August - peridot or sardonyx September - sapphire or lapis October - opal or tourmaline November - topaz or citrine December - zircon or turquoise
C'etait une emeraude carree, une emeraude-cabochon d'un vert assez pale, du vert laiteux de la chrysoprase ou semble luire et trembler un jus d'herbe.
3), to reveal its 'monsterpiece'--a gem-encrusted oval box made for Frederick the Great of Prussia in the 1760s and decorated with gold shepherds and shepherdesses set against a brilliant blue ground of chrysoprase.
chrysolites and beryls and chrysoprases and rubies .
Warmburn, Saxony--I bought 6 very handsome chrysoprases for a trifle--gave [pound]3 -10-0 when they are worth [pound]15 or [pound]20.