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The World's Rarest Mineral Is So Rare It's Only Ever Been Found Once
On first glance, you might mistaken it for amber or topaz; but the unassuming ... who thought the raw gem was a mineral called scheelite. After he faceted the stone, though, he realized that ...
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Perot Museum Presents Topaz: A Spectrum In Stone Exhibit
The Perot Museum of Nature and Science is introducing a new exhibit: Topaz: A Spectrum in Stone. The exhibit highlights the ...