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Oxygen and Our Mineral World

Story by Bob Jones Currently, scientists agree there are about 5,000 identified minerals on Earth. The most common characteristic of these minerals is that the...

6 Intriguing and Eye-Catching Specimens

Editor's Note: This is the latest installment of the Common Ground blog.  By Antoinette Rahn It's been a few years (Ok, it’s been decades) since I...

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