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Epidote
(St. Croix Rockhounds, Stillwater, MN, 1994)
What are those fibers in my rose quartz?
(St. Croix Rockhounds, Stillwater, MN, 2003)
Minerals of the Lynne Deposit, Oneida County, Wisconsin
(St. Croix Rockhounds, Stillwater, MN, 1991)
Minerals and geology of the Weyerhauser Copper Mine, near Gordon, Douglass County, Wisconsin
(St. Croix Rockhounds, Stillwater, MN, 1989)
Cosmetic minerals of Ancient Egypt
(St. Croix Rockhounds, Stillwater, MN, 2000)
Silicon, Silica, Silicates and Silicone
(St. Croix Rockhounds, Stillwater, MN, 1998)
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)
Blue, blue, my quartz is blue
(St. Croix Rockhounds, Stillwater, MN, 1995)
Crystal diving for fluid inclusions
(St. Croix Rockhounds, Stillwater, MN, 1989)