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Definitions of agate geodes on the Web:

Agate-an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
wordnetweb.princeton.edu/perl/webwn
Agate is a microcrystalline variety of quartz (silica), chiefly chalcedony, characterised by its fineness of grain and brightness of color. ...
en.wikipedia.org/wiki/Agate
Agate-A semipellucid, uncrystallized variety of quartz, presenting various tints in the same specimen. Its colors are delicately arranged in stripes or bands, or blended in clouds; : A kind of type, larger than pearl and smaller than nonpareil; in England called ruby; : A diminutive person; so called ...
en.wiktionary.org/wiki/agate
Agate- type of chalcedony quartz that is found in a variety of colors and patterns, with varying color layers.
Most agate geodes occur as nodules in eruptive rocks, or ancient lavas, where they represent cavities originally produced by the disengagement of vapour in the molten mass, and since filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls. Such agates, when cut transversely, exhibit a succession of parallel lines, often of extreme tenuity, giving a banded appearance to the section, whence such stones are known as banded agate, riband agate and striped agate.
Agate-Multi-colored microscopically crystalline, variegated chalcedony. It may be banded, irregularly clouded or have visible impurities as in moss agate. It is a very common variety of quartz principally found in Brazil.
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Agate-A variety of cryptocrystalline quartz in which colors occur in bands; commonly deposited in cavities in rocks.
imnh.isu.edu/DIGITALATLAS/glossary/letter.asp
Agate-A form of chalcedony (quartz) which occurs in many colors that range from transparent to opaque. Agates are found all over the world and are believed to soothe the mind and improve your memory. Some agates are geodes, which means they are hollow in the middle, often with crystals inside
Agate is a common semiprecious silica mineral that has long been used as a gem and ornamental. Agate is the most common variety of chalcedony which is a form of quartz. Agate is, in fact, identical with quartz in composition and physical properties. Composed of silicon dioxide (SiO2), it has a hardness of 7, a glassy luster, a conchoidal fracture, and a specific gravity of 2.60.
Most agates occur in cavities of eruptive rocks or ancient lavas. These agates have a banded structure, successive layers being approximately parallel to the sides of the cavity. During crystallization, the colored bands are not disturbed. Varieties of agate are characterized by peculiarities in the shape and color of the bands, which are seen in sections cut at right angles to the layers.

Agate forms when gas bubbles trapped in solidifying lava become filled with alkali and silica-bearing waters, which coagulate into a gel. The alkali attacks the iron in the surrounding lava, and bands of the resulting iron hydroxide are created in the gel, which loses water and crystallizes, leaving the bands intact. Many agates, when cut in cross-section, reveal striking forms.

In riband agate, the bands appear as straight lines in cross section. Such agate, with white bands alternating with bands of black, brown, or red, is called onyx . A ring or eye agate has concentric circular bands of different colors. A variety having included matter of a green color, embedded in the agate and disposed in filaments and other forms suggestive of vegetable growth, is known as moss agate.
Agate is found throughout the world. In the United States it is produced in several western states: Oregon, Washington, Idaho and Montana are the chief sources of these gemstones.

According to ancient superstition, wearing agate made one agreeable, persuasive, prudent yet bold. It brought God's favor and bestowed the power to vanquish enemies and acquire riches. White agate supposedly cured insomnia.
Some agates are so distinctive that they carry their own names, such as moss agate, a unique form which has feathers of rich mossy green riddling a white agate. Iris agate, another special occurrence of the rock, has a remarkable iridescent sheen. Both forms, along with other varieties, are used in rings, bracelets, and necklaces, and are usually cut large to show off the rich bands of color in the stone. Often, a piece of agate jewelry will have an unusual shape, to accommodate a unique and striking pattern in the stone.

If kept in heat and sunlight, agate can crack and fade, so make sure to store it in a cool, dark place. If agate becomes dirty, it can be washed in soap and a mild detergent solution, but do not use harsh or abrasive chemicals on it. Agates can scratch or crack if they are handled roughly, so be gentle with agate jewelry, and try to avoid slamming it into things or dragging it across hard surfaces.
Agate is the same kind of rock as chert, but in a much purer, more transparent form. It consists of amorphous or cryptocrystalline silica, the mineral chalcedony. Agate forms from solutions of silica at relatively shallow depths and low temperatures, and is exquisitely sensitive to the physical and chemical conditions around it. It is commonly associated with the silica mineral opal. Fossilization, soil formation, and alteration of existing rock can all create agate.
Agate is not a distinct mineral species, but an aggregate of various forms of silica; (SiO2), mainly Chalcedony. Agate hardness is about 6.5 and has a specific gravity of about 2.6. According to Theophrastus, a Greek philosopher of the time of Aristotle, agate (achates) gets its name from the river where the stone was first found, the river Achates in Sicily, (now called the Drillo). Agates are formed by chemical precipitation from a silica-rich solution in rock cavities and are often characterized by bands of different colours.
The colour of agates can vary significantly, depending on the distribution of minerals within each band. Minerals that contribute to the stone colour include: iron oxides (red, brown, black, green), manganese (pink, violet, black), chromium (green, yellow, red), titanium (blue), cobalt (red), nickel (green), and copper (red, blue, and green). The shade of colour is further modified when these minerals work in combination. The colour can occur through an agate band, or it can form as small, dot-like inclusions. Colour can also be influenced by temperature, radiation, pressure, and weathering.
Most agates occur as nodules in eruptive rocks or ancient lavas where they represent cavities originally produced by vapour blowing out from the molten mass. These cavities were then filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls. The first layer spread over the wall of the cavity has been called the "priming," and upon this base zeolitic minerals may be deposited. The first deposit on the wall of a cavity, forming the "skin" of the agate, is generally a dark greenish mineral substance, such as celadonite, delessite or "green earth." These are rich in iron which is probably derived from the decomposition of the agate in the mother-rock. This green silicate may slowly change to a brown oxide of iron (limonite), producing a rusty appearance on the outside of the agate nodule. Freed from its matrix, the outer surface of an agate is often pitted and rough, probably as a result of the removal of the original coating.
Agates are widely distributed, although the main deposits are in India, Brazil, Madagascar, China, Russia and Australia. The most common types of agates are shown below, but there are some unique agates which definitley deserve mention. These include: Kentucky Agate, an agate with bright red bands which is found only in Kentucky and is prized by collectors; Cyclops Agate, a Mexican agate, which shows only a single eye; and Turritella agate, formed from fossil Turritella shells silicified in a chalcedony base.http://www.rockcollector.co.uk/agat.htm
Agate is a variety of chalcedony formed from layers of quartz which usually show varicolored bands. It usually occurs as rounded nodules or veins.

Often tiny quartz crystals form within the stone and add to the beauty and uniqueness of individual stones. These crystals are called drusy (sometimes misspelled as druzy). Lapidaries often cut just the drusy from an agate and jewelers use these drusy cabochons as the main stone or as an accent stone in their jewelry designs.
Agate Slice ( slab ) Jewelry

Agate is an unusual stone. It has class as well as an earthy quality. There are many varieties of agate. Common types are: blue lace agate, moss agate, tree agate and petrified wood. Usually agate is shaped into cabochons or beads. It is commonly made into pendants, necklaces or earrings. AGATE SLICES ARE MOST AFFORDABLE USES IN JEWELRY.

Buy Agate Jewelry Slice Pendants, Agate Slice Bracelet, Agate Slice Necklace, Agate Earrings.

We manufacture and supply finished Agate Slice Jewelry, pendants and raw agate slices ready for your jewelry design. We own and operate a small jewelry workshop in USA. Many of our designers attended ART SCHOOLS and have over 9 years experience in in our jewelry studio, which features more than 400 unique agate jewelry and gemstone jewelry designs that are ready for sale. Our website only shows a handful of these beautiful unique designs. Agates form in many shapes, patterns, and colors so each example below is a good sample of the designs you will receive, not the actual item. we are showing average looking designs. Some will appear more plain or vibrant in your order. Due to the one of a kind nature of the agate stone, the designst will vary VERY slightly from the one in the pictures. Different striations in the rock are to be expected.

Agate Slice Beaded Pendants ( Starting at $3.50 ea. )