Blue Aventurine 14mm Faceted Star - 15-16 Inch 20211007 inclusions of Goethite or Hematite

inclusions of Goethite or Hematite refract the light between the layers of the crystal

if desired

rust reds with white plumes

who performed early research into the many optical properties of mica

fluorannite

Blue Aventurine 14mm Faceted Star - 15-16 Inch 20211007 inclusions of Goethite or HematiteAventurine is a form of quartz, characterised by its translucency and the presence of platy mineral inclusions that give a shimmering or glistening effect termed aventurescence. The most common colour of aventurine is green, but it may also be orange, brown, yellow, blue, or gray. Chrome bearing fuchsite (a variety of muscovite mica) is the classic inclusion, and gives a silvery green or blue sheen. Oranges and browns are attributed to hematite or