William S. Cordua, Ph.D

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Dr. William S. Cordua’s collection includes short popular science articles written on mineralogical and geological subjects. They generally first appeared in the Leaverite News newsletter of the St. Croix Rockhounds in Stillwater, MN. They have been frequently reprinted by other newsletters. Some have won regional and national awards through the Midwest Federation and American Federation. They can be reprinted without charge as long as credit is given to the author, including his affiliation with the University of Wisconsin-River Falls.

Copyright for the materials in this collection is owned by the authors. This digital version is published by the Chalmer Davee Library, University of Wisconsin-River Falls with the consent of the author.

Recent Submissions

Telling meteorites from wrongs

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 2010)
Mineral from giant red suns

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1995)
Moganite - A common mineral with a disapproved name

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1994)
Why pyrite crystals have different shapes

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1994)
Fire of opal

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1993)
Moonmilk

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1993)
Moon mineral found on Earth

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1993)
Temples of galena

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1991)
Minerals of the Bend Deposit, Taylor County, Wisconsin

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1991)
Minerals of the Lynne Deposit, Oneida County, Wisconsin

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1991)
Minnesota kimberlites

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1991)
Mineral named after a continent

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1991)
Minnesotaite

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1990)
Mineral named for Iowa

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1990)
What's in a mineral name?

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1990)
Minerals of the Bronk Quarry, near Winona, Minnesota

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1990)
Ice mineralogy

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1989)
Minnesota twin crystals

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1989)
Crystal diving for fluid inclusions

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1989)
False forms

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1989)