Medicine Bow Plume Agate Rough Medicine Bow Plume Agate displays black plume formations on a white background. The contrast in Medicine Bow Plume Agate creates stunning cabochons. Agate is a form of microcrystaline quartz. It is usually formed in nodules and has transparent, or translucent portions. As with all of the other species in the quartz family, agate takes a high polish with cerium oxide, but also takes a fine polish with tin oxide and diamond. Mohs hardness 6.5 to 7.
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