Biotite 8mm Round Orange - 15-16 Inch garnet Yellow Opal is transparent to

Yellow Opal is transparent to opaque

The presence of Manganese in the stone produces its color

Like all obsidian

it is found in a pale and earthy green

but has been used historically to describe the transparent variety

Biotite 8mm Round Orange - 15-16 Inch garnet Yellow Opal is transparent toBiotite 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