Aventurine is a gemstone variety of quartz characterized by its translucency and sparkly metallic inclusions. Glittery inclusions are typically composed of muscovite mica, which usually results in medium to dark green aventurine stones with a silvery green or blue sheen. Aventurine quartz clarity levels can range from slightly translucent to opaque. Opaque specimens are usually the result of over-abundant fuchsite inclusions. Aventurine quartz has a dull to vitreous luster when cut and polished, but in its rough state it appears very grainy in texture.