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Agates for all jewellry

This is probably our most commen jewellry gemstone. Its avaiable in all colours you can imagine and many forms at Pretty Ogr. Its like being in a candy store...!

 

Size: 18x13x6 mm

 

In stock: 1 of each, at least 

 

Price:  USD  4,45

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Agate is a cryptocrystalline variety of silica, mainly chalcedony, characterised by its fineness of grain and brightness of colour. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks (formed when igneous or sedimentary rocks are subjected to high pressures and temperatures).
Most agates occur as nodules in volcanic rocks or ancient lavas, in former cavities produced by volatiles in the original molten mass, which were then filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls.
Agate has also been known to fill veins or cracks in volcanic or altered rock underlain by granitic intrusive masses. Such agates, when cut transversely, exhibit a succession of parallel lines, often of extreme tenuity, giving a banded appearance to the section. Such stones are known as banded agate, riband agate and striped agate.Theophrastus, a Greek philosopher and naturalist, found and named the stone along the banks of the river Achates during 4-300 BC. Colourful agates and other chalcedonies were obtained over 3,000 years ago from the Achates River, now called Dirillo, in Sicily.

Agate stands for health and safety.

 

 

 

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Latest update: 22 september 2015