AULAS PS 4 - 104868402065434628622 - Álbuns da web do Picasa
This is a rare "Fire Opal" or Girasol, found in Mexico. It looks like there are little clouds inside.
GLASS cabochon: called Dragon's Breath, or Mexican Opal (because of the blue flashes) NOT an actual OPAL, but beautiful nonetheless
Very Fine Mexican Jelly Fire Opal. Most fire opal deposits are in Mexico. They consist of silicon dioxide or silica spheres arranged in an orderly pattern w/iron oxide dispersed throughout giving the fire opal its distinctive brilliant flame-like colors