Peruvian Chrysocolla 9x13-12x16mm Top Drill Irregular Flat Drop - 15-16 Inch Goethite in Amethyst and Cutter

and Cutter

but those varieties are transparent

containing sodium

a type of reversible photochromism

a cryptocrystalline Quartz

Peruvian Chrysocolla 9x13-12x16mm Top Drill Irregular Flat Drop - 15-16 Inch Goethite in Amethyst and CutterChrysocolla, a hydrous copper silicate, is often mistaken for turquoise due to its rich blues and blue to greens. It often also occurs with colors of rust, copper, black, white and reddish brown in speckles, veins and brecciated patterns. It is a very soft stone typically found near copper deposits. Chrysocolla was first described by Theosphrastus, a Greek philosopher and botanist who also named the stone, in 315 BCE.