Peruvian Chrysocolla 9x13-12x16mm Top Drill Irregular Flat Drop - 15-16 Inch Goethite in Amethyst a type of reversible photochromism

a type of reversible photochromism

Shungite has been used as a folk medical treatment since the early 18th century

The fibrous asbestos inclusions in the stone give it the flash that inspired its name

mineral deposits can create stone in the place of the decaying wood

a cryptocrystalline Quartz

Peruvian Chrysocolla 9x13-12x16mm Top Drill Irregular Flat Drop - 15-16 Inch Goethite in Amethyst a type of reversible photochromismChrysocolla, 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.