Sunday, December 16, 2018
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Rock Science: The Era of “Super-Large” Diamonds

By Steve Voynick Diamonds have been making big headlines this year. And that’s because mines in southern Africa are yielding some of the biggest diamonds...
Ewingite oxycarbonate

Update: The Carbon Mineral Challenge

By Steve Voynick The International Mineralogical Association (IMA) continues to recognize new carbon-bearing minerals, thanks to the work of the Deep Carbon Observatory and its...

Rock Science: Lithium — The Battery Metal

By Steve Voynick The lithium-bearing minerals most familiar to collectors are spodumene and trilithionite (formerly “lepidolite”). The kunzite variety of spodumene, or lithium aluminum silicate,...
Sulfur in sedimentary rocks

Rock Science: The Saga of Sulfur

By Steve Voynick With their nearly transparent, sharp-edged, bipyramidal and tabular crystals, fine specimens of sulfur are eminently collectible. But it is sulfur’s color—a pure...