Biotite 6mm Round Orange - 15-16 Inch African Blue Opal The name is derived from

The name is derived from the Charo River in eastern Siberia

who first catalogued the stone in 1902

Amazonite is a member of the feldspar family

as it is softer than both Jasper and Rhyolite

brown and orange

Biotite 6mm Round Orange - 15-16 Inch African Blue Opal The name is derived fromBiotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks. These include annite, phlogopite, siderophyllite, fluorophlogopite, fluorannite, eastonite, and many others. The name "biotite" is used because these minerals generally cannot be distinguished without optical, chemical, or x ray analysis. Biotite was named in honor of the French physicist Jean Baptiste Biot, who performed early