Amorphous crystals are described as having no particular shape and lacking an inner structure. This lack of formal shape and flexible internal organization allows energetic vibrations to pass through amorphous crystals quickly and without any restrictions. Amorphous crystal energetic vibrations tend to be strong acting catalysts for growth. Some examples of Amorphous shaped specimens would be Amber, Moldavite, Obsidian, Opal, and Petrified Wood.