Such specimens are natural crystals coated with some sort of metal (titanium, gold, silver, ...).
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| About 4cm long, 3 cm wide and 2.5-3 cm high Rainbow Aura Quartz |
" Flame or rainbow aura quartz have been enhanced with a combination of titanium and niobium. Titanium molecules are bonded to the quartz by the natural electrostatic charge of the crystal in a process known as magnetron ionization. The brilliant color of flame aura is the result of optical interference effects produced by layers of titanium. Since only electricity is used to deposit the titanium layers and create these colors, very little heat is involved and the integrity of the crystal is maintained. The crystal does not become brittle or prone to breakage as with other enhancements."- source: Wikipedia
Photos of Rainbow Aura Quartz from the Internet:
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