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Chiastolite is also known as the Cross Stone for the cross matrices of browns
Rainbow Obsidian earned its name from the chatoyant
periwinkle
and forms naturally as a glassy
Biotite 8mm Round Orange - 15-16 Inch Dark Labradorite Chiastolite is also known asBiotite 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
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