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Smoky Quartz

Why Minerals Have Color

By Bob Jones There are two reasons I enjoy attending mineral symposia. One is that the social events and activities that surround such events give...
Red clay Permian

Moroccan Aragonite: Specimens by the Millions

Story and Photos by Bob Farrar Mention Morocco to a rockhound, and it is likely to bring to mind visions of exotic, rare, and beautiful...
Farncomb gold-Denver Museum

On the Rocks: Must-See Denver Show

By Bob Jones It seems like every time I go to Denver for the shows in September, something new is happening. What started out as...

What to Cut: Gary Green Jasper

By Russ Kaniuth Gary Green Jasper, also known as Larsonite, and the new batch of material being mined called Caldera Jasper, is a petrified bogwood...

Rock & Gem Kids: Setting Sights on Spinel

By Jim Brace-Thompson Spinel (magnesium aluminum oxide) forms beautiful crystals that are sometimes confused for the brilliant-red gem variety of corundum known as ruby. Unlike...
trilithionite

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,...

Rock Shops of Distinction: Mining Supplies & Rock Shop

Editor's Note: This is the first of a two-part 'Rock Shops of Distinction' feature. Story and Photos by Jim Brace-Thompson Riddle me this: When is a...
Adamite-Mapimi

Exploring Mexico’s New Classics: Adamite and Legrandite

Story and Photos by Bob Jones Serious collectors can name most of the classic minerals. They would include silver from Kongs­berg, Norway; proustite from Chañarcillo,...

Black Rock Desert Geode Cab

By Bob Rush • Bench Tips column A few weeks ago, when I was cutting slabs off the face of a Black Rock Desert geode,...

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