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What are those fibers in my rose quartz?
(St. Croix Rockhounds, Stillwater, MN, 2003)
Cosmetic minerals of Ancient Egypt
(St. Croix Rockhounds, Stillwater, MN, 2000)
Thunder Bay Agate Mine
(St. Croix Rockhounds, Stillwater, MN, 2001)
Minerals that attack your concrete driveway
(St. Croix Rockhounds, Stillwater, MN, 2006)
Why do some mineral change color when you turn them?
(St. Croix Rockhounds, Stillwater, MN, 2009)
How amethyst cathedrals form
(St. Croix Rockhounds, Stillwater, MN, 2007)
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)