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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 classic literature ?
Over in the vacant lots was Jasper, young, coal black, and of magnificent build, sitting on a wheelbarrow in the pelting sun--at work, supposably, whereas he was in fact only preparing for it by taking an hour's rest before beginning.
Jasper went to work energetically, at once, perceiving that his leisure was observed.
We made great havoc in Touraine, until we came into Romorantin, where I chanced upon a gold chain and two bracelets of jasper, which were stolen from me the same day by a black-eyed wench from the Ardennes.
All that I can make out is that Miss Reade is going to marry Jasper Dale, and I don't like the idea one bit.
Forty years later I wrote to her, across the leagues of land and sea that divided us, and told her that Jasper Dale was dead; and I reminded her of her old promise and asked its fulfilment.
Sorry to hear from Tope that you have not been well, Jasper.
Jasper is a dark man of some six-and-twenty, with thick, lustrous, well-arranged black hair and whiskers.
We shall miss you, Jasper, at the "Alternate Musical Wednesdays" to-night; but no doubt you are best at home.
Jasper listens, starts from his chair, and catches a young fellow in his arms, exclaiming:
Jasper stands still, and looks on intently at the young fellow, divesting himself of his outward coat, hat, gloves, and so forth.
That, ladies and gentlemen,' said Mrs Jarley, 'is jasper Packlemerton of atrocious memory, who courted and married fourteen wives, and destroyed them all, by tickling the soles of their feet when they were sleeping in the consciousness of innocence and virtue.
He had the mysterious juruparis of the Rio Negro Indians, that women are not allowed to look at and that even youths may not see till they have been subjected to fasting and scourging, and the earthen jars of the Peruvians that have the shrill cries of birds, and flutes of human bones such as Alfonso de Ovalle heard in Chile, and the sonorous green jaspers that are found near Cuzco and give forth a note of singular sweetness.