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opaque, impure cryptocrystalline quartzquartz,
one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO2.
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, usually red, but also yellow, green, and grayish blue. It is used as a gem. Ribbon jasper has the colors in stripes.


city (1990 pop. 13,553), seat of Walker co., NW central Ala.; inc. 1889. Jasper is a trade and processing center in a coal and timber area. There is agriculture and the manufacture of sporting goods and furniture, as well as bottling and poultry processing.



a compact, fine-grained rock, composed mainly of quartz, chalcedony, and colored impurities of other minerals, such as hematite, goethite, manganese hydroxides, chlorite, and actinolite. Jasper is one of the most common and most beautiful gems.

On the basis of composition, jaspers are subdivided into essentially quartz jaspers proper, quartz-chalcedonic jasperoids, and feldspar-quartz jasper-like rocks. They are characterized by good hardness (5.5–7.0 on Mohs’ scale), strength, a large variety of colors, and the capacity to acquire a high polish. Various shades of red, green, yellow, and gray predominate; red-brown, black, and white are encountered less frequently. Jaspers are opaque and exhibit a conchoidal fracture. On the basis of texture, they are subdivided into solid, monocolored jasper, striped jasper, multicolored jasper, with colored veins and spots, and spheroidal, or “penny,” jasper. Landscape jasper, a type of multicolored jasper, is especially valuable. Jaspers are deposited in the form of layers, lenses, and strata measuring tens or hundreds of meters in thickness.

Jaspers are polygenous formations. Jasper proper is most often metamorphosed siliceous radiolarian ooze and argillaceous siliceous deposits genetically linked to greenstone effusive rocks and tuffs of spilite-keratophyre formations (for example, the Southern Urals deposits at Kalkan and the Orsk group with Mount Polkovnik, composed of landscape jasper). Jasper-like hornblendes and other jasper-like rocks were formed in the course of contact metamorphosis or silicification of various shales and effusive rocks (for example, the Revnevskoe and Gol’tsovoe deposits and the Leninogorsk group in the Rudnyi Altai). Outside the USSR, jasper deposits are found in the USA, India, and Venezuela.

Jasper has long been used for making fine objects, such as cylindrical seals, jewelry, and amulets, and Florentine mosaics and other interior decorations, such as vases, fireplaces, and columns. It is currently used in fine crafts, jewelry, and the manufacture of mortars, knife-edge bearings, and step bearings.


Kievlenko, E. la., and N. N. Senkevich. Geologiia meslorozhdenii podelochnykh kamnei. Moscow, 1976.



A dense, opaque to slightly translucent cryptocrystalline quartz containing iron oxide impurities; characteristically red. Also known as jasperite; jasperoid; jaspis.


1. an opaque impure microcrystalline form of quartz, red, yellow, brown, or dark green in colour, used as a gemstone and for ornamental decoration
2. a dense hard stoneware, invented in 1775 by Wedgwood, capable of being stained throughout its substance with metallic oxides and used as background for applied classical decoration


The part of the Tomcat servlet container that converts JSPs to servlets. See Tomcat.
References in periodicals archive ?
An extraordinary example of late 18th century Wedgwood, also received from the Deutscher's, is the Homer Vase (c 1800) executed in blue jasperware with white relief ornament by John Flaxman, the younger (1755-1826), the foremost English Neoclassical sculptor.
Two hundred fifty Wedgwood items Hill be on display, while a special Jasperware gift is being readied for the British ambassador to present, hopefully, to "the highest ranking U.
Lady Lever Art Gallery South End galleries, Opening spring 2016 The galleries will be returned to their original architectural design and objects including the best collection of Wedgwood jasperware in the world, one of the finest collections of Chinese porcelain in Europe and outstanding 18th-century paintings, furniture and sculpture, will be on show in stunning new displays.
The museum will lie at the heart of THIS highly decorative Wedgwood Jasperware calyx-krater shaped vase and cover decorated typically in relief with classical subjects, circa 1900, is one of a number of pieces on sale at Chester Antiques Show.
Elizabeth Sharpe, Wandsworth, South-West London AWHAT you have are pieces of Wedgwood Jasperware.
Furthermore, he proceeded on a reliable technical basis: Pate-sur-pate and Jasperware.
It was around the time that classical antiquities were being discovered in Etruscan tombs and Wedgwood and Bentley produced copies in their signature duck egg blue and cream jasperware.
The new site reflects the timeless sophistication of Wedgwood fine china and the blue and white Jasperware for which the manufacturer is well known.
Wedgwood enlarged its assortment of cufflinks, chokers and the like in the familiar Jasperware.
New displays will highlight very rare objects such as two copies of the celebrated Portland Vase and three - of possibly only four in the world - complete jasperware fireplaces.
In 1793, the Wedgwood factory produced a fine black and white jasperware chess set designed by the sculptor John Flaxman.