Aventurine quartz gets its color from small, included reflective crystals and results from the nature of the inclusions. Green has platy green fuchsite mica inclusions, brown comes from pyrite, and greenish brown is attributed to the mineral goethite. Other varieties in bluish and orange hues also occur. Confusion with aventurine feldspar, amazonite, and jade is possible. Aventurine quartz is commonly found in Brazil, India, Russia, the U.S., Japan, and Tanzania.