Geode


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geode

(jē`ōd), hollow, globular rock nodule ranging in diameter from 1 to 12 in. (2.54–30.5 cm) or more. Most geodes are partly filled with mineral matter; they have a thin layer of chalcedony ("wavy" quartz) covering an inner lining of inward-projecting crystals. These spectacular crystals, generally quartz or, less often, calcite, make geodes highly prized by collectors. Geodes are formed in a cavity such as might be found inside a fossil shell buried in sediment. At the beginning, this cavity is probably filled with a concentrated salt solution. The first step in the creation of a geode is the formation along the inner cavity wall of a layer of gelatinous silica, which will eventually be transformed into the chalcedony layer. As the water surrounding the layer becomes less salty, osmosis induces migration of fluids into the cavity. This results in a buildup of pressure, causing the cavity to expand until the water inside and outside is equally salty. When the silica gel dehydrates, crystallizes to form chalcedony, and cracks, mineral-bearing water enters to slowly deposit the inward-projecting crystals. A geode measuring 26 ft (8 m) long and 6 ft (1.8 m) across was found in an old silver mine near Almería, NE Spain, in 2000. See also concretionconcretion,
mass or nodule of mineral matter, usually oval or nearly spherical in shape, and occurring in sedimentary rock. It is formed by the accumulation of mineral matter in the pore spaces of the sediment, usually around a fossil or fossil fragment acting as a nucleus.
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Geode

 

a form of natural mineral aggregate. It is represented by closed cavities in certain rocks, which are filled with cryptocrystalline or eucrystalline aggregates of minerals. Geodes may be isometric or round or have other shapes. The mineral substance in a geode is frequently deposited by layers, forming concentric zonal layers (for example, agates). Geodes may not be filled completely with minerals; in this case a hollow place remains in the middle that is usually strewn with vugs of crystals, stalactites, and so forth. They may be more than 1 m long in cross section; the minimum size of a geode is fractions of a centimeter (so-called amygdaloids).

geode

[′jē‚ōd]
(geology)
A roughly spheroidal, hollow body lined inside with inward-projecting, small crystals; found frequently in limestone beds but may occur in shale.

Geode

A family of X86-based microprocessors from AMD. Natively running Windows and Linux applications, the 32-bit Geode chips are used in embedded systems due to their low power requirements. The Geode was originally launched in 1999 by National Semiconductor, using a processor core from Cyrix after the two companies merged in 1997. In 2003, AMD acquired the Geode series. See x86 and AMD.
References in periodicals archive ?
The interior of the inner geode is frequently solid quartz.
Released three weeks after the iPhone application (currently available in the iTunes store), the Geode Communicator for the iPad became available in the iTunes store on June 22nd, 2010, making communicating more, faster and easier.
The AMD Geode GX SOM-144 RDK is a reference design platform designed for small, embedded or industrial applications where power, size, performance and reliability are crucial issues.
The addition of Geode technology will enable the NextVision N210 Video Processor to take a ViewSonic display and transform it into a wireless MPEG smart client.
We are immediately and significantly changing the Mobile Payments space forever with the upcoming launch of the Geode.
Geode also raises legal objections on the basis of the constitutionally guaranteed right of ownership.
The AMD Geode GX processor family is designed to provide the ideal combination of low power consumption, excellent performance and small size.
A spokesperson for BenQ said that the Geode Smart Display reference design offers a high level of performance without compromising power.
We are scratching the surface with this inaugural launch of the Geode digital wallet and will continue to drive the revolution in intelligent cases," stated Erik Ross, CSO, iCache Inc.
In its policy statements on the planned revision of current EU Directives on the internal gas and electricity markets, GEODE is calling for eligibility for all distributors in 2003 for electricity and in 2004 for gas.
With Mac's involvement in our product launch, we are sure to see accelerated market development for the Geode, internationally.
TELECOMWORLDWIRE-20 November 2000-National Semiconductor's Geode processor to power i3's set-top box (C)1994-2000 M2 COMMUNICATIONS LTD http://www.