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Crystal diving for fluid inclusions
(St. Croix Rockhounds, Stillwater, MN, 1989)
Minnesota twin crystals
(St. Croix Rockhounds, Stillwater, MN, 1989)
The world's largest crystal
(St. Croix Rockhounds, Stillwater, MN, 1988)
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)