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Now showing items 11-20 of 77
How amethyst cathedrals form
(St. Croix Rockhounds, Stillwater, MN, 2007)
Drifting Cuyuna tourmaline
(St. Croix Rockhounds, Stillwater, MN, 1999)
Why pyrite crystals have different shapes
(St. Croix Rockhounds, Stillwater, MN, 1994)
Telling meteorites from wrongs
(St. Croix Rockhounds, Stillwater, MN, 2010)
Titus and the ugly rocks - a mineral mystery story
(St. Croix Rockhounds, Stillwater, MN, 2009)
Bauxite and greenhouse earth
(St. Croix Rockhounds, Stillwater, MN, 2007)
What's the world's most common mineral?
(St. Croix Rockhounds, Stillwater, MN, 2004)
Minnesota twin crystals
(St. Croix Rockhounds, Stillwater, MN, 1989)
The world's largest crystal
(St. Croix Rockhounds, Stillwater, MN, 1988)
Wisconsin talc
(St. Croix Rockhounds, Stillwater, MN, 1993)