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Crystal diving for fluid inclusions
(St. Croix Rockhounds, Stillwater, MN, 1989)
Why pyrite crystals have different shapes
(St. Croix Rockhounds, Stillwater, MN, 1994)
Minnesota twin crystals
(St. Croix Rockhounds, Stillwater, MN, 1989)
The world's largest crystal
(St. Croix Rockhounds, Stillwater, MN, 1988)
How fast can crystals grow?
(St. Croix Rockhounds, Stillwater, MN, 2004)
What's in a vug?
(St. Croix Rockhounds, Stillwater, MN, 1988)
Why do such large crystals form in pegmatites?
(St. Croix Rockhounds, Stillwater, MN, 1987)