This listing describes some of the different types of occlusions that may occur occur in crystals.
Devic. A crystal of any shape with multiple internal fractures & occlusions of trapped water, air & gases. These occlusions are sometimes called veils and faerie frost. Connects you to the devic nature spirit realms, to communicate & help them with their work for Earth.
Faden. Self-healed crystal (see photo). You can see the line where it was broken and healed itself. Excellent for work with personal problems requiring healing and going on. Some are also Growth Interference Crystals.
Phantom Crystal. Crystal that grows completely over another small crystal, appearing wispy and ghost-like. A crystal that stopped growing then at a later time began growing anew, following the old outlines. Help those of us likewise stopped. Multiplies the energy of the stone many times over.
Rainbow. Any form of quartz that naturally flashes rainbows when turned in the light, usually at an occlusion point. Reminds you to see the natural beauty all around you at every moment. Promotes happiness, hope, optimism, respect for all life.
Selene. Crystals with rounded inner occlusions reminiscent of various phases of the moon (whose ancient name is Selene). Helps you connect with your yin, reflective, intuitive qualities.
Teacher. Shapes and forms inside crystals, resembling humans, animals, and changing shape at different times. Helps you connect to the information from your teachers. Also can be Buddha/Guardian crystal.