Aventurine is a raw quartz whose appearance and bright green color comes from deposits Fucsite (Chrome-Mica) in it.
Forms in igneous rocks, in sediments and crystalline schists. Aventurine Quartz is a translucent chalcedony in granular aggregates with small inclusions that reflect light causing the phenomenon of "avventurescenza”.
Its name comes from the Italian "a ventura" which refers to the mica flakes apparently randomly distributed on its surface.
There were unfortunately passed on information about its therapeutic properties and therefore not historical information related to this gem.
Aventurine is a translucent chalcedony in granular aggregates with small inclusions that reflect light causing the phenomenon of "avventurescenza”.
These are normally reeds of mica (fuchsite, actinolite, goethite and others) or chlorite, giving the stone a bright brown or green (the latter mainly due to the color fuchsite.
In the presence of considerable amounts of muscovite, you are having a silvery sheen, while there exists a variety lipoclastic, aventurine Eastern or sun-stone, in which the abundance of deposits of hematite causes of red internal reflections.
It is generally considered a cut stone of great value.
Quartz Aventurine is mined mainly in Brazil, China, India and Russia, while the brown comes mainly from Brazil.