-800x800.JPG "Green Onyx Crystal Quartz Gemstone 925 Sterling Silver Gold Plated Bangle Jewelry")
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Green Onyx is black and white banded agate (cryptocrystalline or chalcedony quartz). It should not to be confused with onyx marble, which is limestone. The banding of onyx is parallel and consistent. Some varieties of onyx differ in color, such as sard onyx, which has a brown base and white upper layer, cornelian onyx, which has a red base and white upper layer, and niccolo onyx, which has a very thin upper layer, allowing the black base color to show through as grey or blue. Onyx takes its name from the Greek word "onux", which means fingernail; this could be due to a Greek legend, in which Eros mischievously cut the fingernails of Aphrodite with an arrowhead whilst she slept, and the gods turned the clippings into stone. Onyx was cut and carved as a gemstone by the Ancient Greeks and Romans in cameos. Intaglio etchings (negative relief engravings) were also made from onyx. These carvings showcase the banding of onyx.
Crystal
Quartz is one of the most important minerals on earth and makes up one of the
most popular gemstone groups in the world of colored stones. It is the second
most abundant mineral found in Earth's continental crust, second only to the
feldspars. The name 'quartz' is thought to be derived from the German word
'quarz', which likely originated from the Slavic and Polish words meaning
'hard'. The name is descriptive in regard to quartz being the definitive
mineral that measures 7 on the Mohs scale of hardness. Other gemstones are
often compared to quartz when it comes to classifying them as being hard, soft
or durable.
Description
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