Aventurine is a form of translucent quartz with suspended platy mineral inclusions that give a shimmering or glistening effect termed aventurescence.   Aventurine is usually green, although a butterscotch/orange variety is also found occasionally and rarely it comes in other shades of  brown, peach, yellow, red and blue.    In the 18th century Venetian glassmakers made a synthetic version called “goldstone” which is still popular today.