mineral impurities making the stone resemble landscapes. Adventurine   http://en.wikipedia.org/wiki/File:Aventurine.jpg Aventurine is a form of chalcedony, characterised by its translucency and the presence of platy mineral inclusions that give a shimmering or glistening effect termed aventurescence . Chrome-bearing fuchsite (a variety of muscovite mica ) is the classic inclusion, and gives