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Calcite on Copper
Calcite on copper, 2.6 cm, from the Quincy mine, Houghton County, Keweenaw Peninsula, Michigan. Illustrated in Mineral Collections in Arizona-I (2013). Ex William W. Jefferis (1820-1906), ex Carnegie Museum of Natural History, ex Delbert Oswald (1915-1994). Jeff Scovil photo.
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