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Agate Nodule from Brazil
This is Agate nodule that we dug out of our “archives”. These were mined at least 25 years ago. Most of these agate nodules are already polished, however the unpolished ones are “ready to go” for anyone working with a flat lap. Definitely beautiful as they are, but they 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.