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What to Cut: Turning to Turquoise

By Russ Kaniuth Turquoise is one of the most prestigious stones used in lapidary. It’s been used for thousands of years, even as far back...
Pyrolusite dioxide

Rock Science: Pyrolusite and Manganese

By Steve Voynick Manganese is an element that we rarely, if ever, see in its metallic state, but that nevertheless plays a big part of...

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