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Aventurine is a form of "quartz, characterised by its translucency and the presence of platy["clarification needed] "mineral "inclusions that give a shimmering or glistening effect termed "aventurescence.
The most common colour of aventurine is green, but it may also be orange, brown, yellow, blue, or grey. Chrome-bearing "fuchsite (a variety of "muscovite "mica) is the classic inclusion, and gives a silvery green or blue sheen. Oranges and browns are attributed to "hematite or "goethite. Because aventurine is a "rock, its physical properties vary: its "specific gravity may lie between 2.64-2.69 and its "hardness is somewhat lower than single-crystal quartz at around 6.5.
Aventurine feldspar or "sunstone can be confused with orange and red aventurine quartzite, although the former is generally of a higher transparency. Aventurine is often banded and an overabundance of fuchsite may render it opaque, in which case it may be mistaken for "malachite at first glance.
The name aventurine derives from the "Italian "a ventura" meaning "by chance". This is an allusion to the lucky discovery of aventurine glass or "goldstone at some point in the 18th century. Although it was known first, goldstone is now a common imitation of aventurine and sunstone. Goldstone is distinguished visually from the latter two minerals by its coarse flecks of "copper, dispersed within the glass in an unnaturally uniform manner. It is usually a golden brown, but may also be found in blue or green.
The majority of green and blue-green aventurine originates in "India (particularly in the vicinity of "Mysore and "Chennai) where it is employed by prolific artisans. Creamy white, gray and orange material is found in "Chile, "Spain and "Russia. Most material is carved into beads and figurines with only the finer examples fashioned into "cabochons, later being set into "jewellery.
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