Aventurescence

Aventurescence is an optical phenomenon that looks like "Glitter" in crystals or stones such as Aventurine or Sunstone.  It's seen as a flash of light as a crystal is moved under a source of incident light. 

 It is caused when light entering the crystal travels until it encounters a tiny platelet-shaped inclusion of mica, copper or hematite within the crystal and is reflected. Because the platelets share a common orientation, they all reflect simultaneously and produce a quick flash of light as the stone is moved under the source of incident light. 

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