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 ?
Pivotal welcomes contributors and developers to download and evaluate Geode.
The Geode Communicator allows you to select short, canned texts or record a longer, more in-depth message.
A detailed ConsumerBench score report for the AMD Geode LX800@0.
Wyse's new S class of Winterm thin-client solutions demonstrates the full capabilities of the high-performance, low-power AMD Geode GX product family," said Erik Salo, AMD's director of marketing for the Personal Connectivity Solutions Group.
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.
Managing Director, International for iCache said, "We're looking forward to the release of the Geode - an exciting and unprecedented event.
With established wine drinkers continuing their love affair with Chardonnay and sophisticated Millennial Generation consumers seeking exciting, environmentally conscious new brands, the time is right for wine lovers to discover Geode.
By expanding our product portfolio with this new, very low power version of the highly successful AMD Sempron processor and extending the temperature support in our Geode line, AMD is delivering on our promise of customer-centric innovation for a range of embedded markets," said Greg White, vice president, Embedded Computing Solutions Division, AMD.
Built upon AMD's x86 architecture, the AMD Geode processor eases implementation, application support, and peripheral support for Linux thin clients.
Insyde provides AMD customers off-the-shelf optimized BIOS and firmware solutions for the entire AMD geode processor family, as well as custom BIOS development, engineering support and systems integration services.
NET as well as National Semiconductor's latest Geode SC1100 processor.
National Semiconductor's best-in-class Geode reference design is the preferred platform for PC and consumer manufacturers that are developing user friendly Smart Display devices for this new market," said Michael Polacek, vice president of National's Information Appliance Division.