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The name "biotite" is used because these minerals generally cannot be distinguished without optical
brown phlogopite and clear muscovite
The presence of Manganese within the stone produces the purple hue
Stromatolites date back more than three billion years and are the oldest known fossils
Multi Tourmaline 3mm Round Faceted AA Grade Banded - 15-16 Inch Color_Brown The name "biotite" is usedTourmaline is classified as a semiprecious stone and occurs in a vast array of colors, everything from colorless to black, from pastel to bright to dark. It can even exhibit various colors within the same specimen. Its name derives from the Sinhalese word turamali, which translates to stone of many colors. Due to this variety of colors, Tourmaline has often been confused with other stones. Many stones in the Russian crown jewels from the 17th century
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