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Agate Nodules from Brazil
We dug these agate nodules out of our “archives”. They were mined at least 25 years ago. These agate nodules have be cut in half to show the internal pattern. Most of these agate nodules are already polished, however the unpolished nodules are “ready to go” for anyone working with a flat lap. These agate nodules are beautiful as they are, but can also be cut into premium stones.
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 7.