The appearance of this green variety of quartz is characterized by a spangled or glittery aventurescent effect that can be seen when the stone is rotated in front of a light. This is caused by inclusions of different minerals, mainly platelets of green fuchsite.
Aventurine is sometimes found in a reddish brown color, which is caused by inclusions of goethite or hematite.
Green aventurine quartz is often dyed or sold as jade or nephrite jade. Selling it as any variety of jade is completely forbidden. Real jade is very rare in these colors.