Photographer: Calvin J. Hamilton
Date Added: 2010-11-12
Location: Sweetwater mine, Reynolds County, Missouri

Photographer: Calvin J. Hamilton
Date Added: 2008-12-17
Location: Pinal County, Arizona

Photographer: Calvin J. Hamilton
Date Taken: 2005-01-04
Location: Lengenback quarry, Imfeld, Binnatal, Valais, Switzerland

Photographer: Calvin J. Hamilton
Date Taken: 2004-12-30
Location: Tsumeb, Namibia