A shimmering gemstone variety of quartz that contains flecks of mica, hematite, or other minerals, giving it a sparkling or glittery appearance.
From Italian avventurina, literally meaning 'by chance.' The name comes from the accidental discovery by Venetian glassmakers of a way to create a sparkling glass, and it was later applied to similar-looking natural stones.
Green aventurine has been worn for thousands of years and is called 'the stone of opportunity'—people carry it believing it brings luck, which is pretty fitting since the name itself means 'by chance!' It's a self-fulfilling prophecy in rock form.
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