This Specimen has been sold.
4.25" Amethyst Crystal Cluster over Biotite - India
This is a 4.25" wide cluster of amethyst crystals that formed over sheets of biotite mica. It was collected from the Kakamunurle Mine in Tamil Nadu, India and comes with an acrylic display stand.
Amethyst is a purple variety of quartz (SiO2) and owes its violet color to natural irradiation, iron impurities, and the presence of trace elements, which result in complex crystal lattice substitutions. It’s considered a semi-precious gemstone, and just two centuries ago was considered to have a value on par with diamonds, sapphires and rubies. The largest and best known amethyst deposits occur in southern Brazil and Uruguay but many localities around the world produce an amazing variety of amethyst crystals and formations.