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November-December 2014

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Collector's Note: A New Find of Manganese-rich Pumpellyite from the Manganese Mine, Copper Harbor, Keweenaw County, Michigan

THE STATE OF MICHIGAN has considerable history when it comes to pumpellyite. As summarized by Robinson (2004, p. 161):

Originally the mineral was described under the name ‘lotrite’ from the southern Carpathian Mountains (Murgoci 1901). Charles H. Palache, who in 1920 made the first systematic study of the secondary minerals in the altered [Michigan] copper lodes for the Calumet and Hecla Copper Mining Company, noted a green mineral which he believed to be a new mineral closely related to the zoisite-epidote family. Unaware of Murgoci's earlier work, he submitted a manuscript to Calumet and Hecla describing the ‘new’ mineral, proposing to call it ‘kearsargeite.’ B. S. Butler didn't like the name, and Palache changed the manuscript by crossing out ‘kearsargeite’ and penciling in ‘pumpellyite,’ in honor of Raphael Pumpelly.

Travis A. Olds is a PhD student researching environmental actinide chemistry and mineralogy at the University of Notre Dame.

Shawn M. Carlson is a 1991 graduate (geology) of Michigan Technological University and a consulting mineralogist.

Dan Behnke, a retired government employee, is an avid collector of microminerals and a specialist in photomicrography.

Owen P. Mills is director of the Applied Chemical and Morphological Analysis Laboratory and a staff member in the Materials Science and Engineering Department at Michigan Technological University.

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