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Aventurine is a commercial term for a variety of quartz that is green. It contains glistening fragments (usually mica such as fuchsite, but also hematite), which can be cut and polished as a gemstone. Most commonly when the general public encounter this stone it is in the form of green stone beads that can be anywhere from a pale to a medium green color. Frequently these beads have been treated with oil to make the stone look a darker color than it would naturally or even dyed to make the color more attractive.

Name: From Italian "a ventura", meaning by chance. This came from Aventurine glass, that was colored by small copper inclusions, that was first prepared accidentally in early 18th century Italy.