2.4" Cluster Of Brilliant Blue Azurite Suns - Australia
This is a stunning cluster of two brilliant blue Azurite suns on a kaolinitic siltstone/ sandstone matrix. There were collected from the Malbunka Copper Mine in the Northern Territory of Australia.
They are thought to have been formed by hydrothermal fluids carrying copper ions through the bedding planes in the rock formation. Carbonate molecules and copper ions in the groundwater nucleated around mineral grains in the kaolinite, which resulted in crystallization of the azurite. Because the azurite was forced to grow in a laterally-compressed and radiating manner along preferred bedding planes, the azurite grew uniformly outward, often producing circular shapes.