Huge Rare Rainbow Blacknite Quartz Crystal Cluster Iridescent Ferro Goethite/Hematite Metallic with Covelline & Bornite Coated Quartz Crystal Cluster.
Almost like a black aura quartz but it's 100% natural occurrence with iridescent patina/rainbow colours such as pink, purple, black, blue, yellow radiance!
Iridescent hematite, also called rainbow hematite, displays a variety of beautiful interference colours. Usually, a thin film comprised of aluminium and phosphate was found to coat such hematite.
The extreme heat added the iridescence to the spectacular hematite to give its colour.