Biotite 6mm Round Orange - 15-16 Inch African Blue Opal and Magtalisai

and Magtalisai

as it is softer than both Jasper and Rhyolite

orthorhombic crystals or in massive form

The inclusions are of manganese or iron

brown and orange

Biotite 6mm Round Orange - 15-16 Inch African Blue Opal and MagtalisaiBiotite 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