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Calling it aventurine quartz helps to distinguish it from the orange to red aventurine feldspar which, except for being softer and sometimes more translucent, has very similar properties and appearance.
Specific PropertiesAventurine is identified by its metallic sheen, and can be of various colors, like green, red, orange, yellow, or blue. Most aventurine offered commercially is green. Due to its grainy structure aventurine has an irregular fracture, so raw, unpolished pieces have a rough surface similar to marble or quartzite. Different from marble, it is not porous, but mostly compact and dense, just like quartzite.
In green aventurine the color is often caused by a chromium-bearing muscovite called "fuchsite", K(Al,Cr)2AlSi3O10(OH)2, a mineral of the mica group.
Blue aventurine is sometimes labeled blue quartz, which is very confusing. The color is then often caused by dumortierite, (Al,Fe)7O3(BO3)(SiO4)3.
Locations and SpecimenLots of good quality aventurine comes from India. Other sources are Brazil and Norway.
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Impressum - Source: http://www.quartzpage.de/aventurine.html