Goethite
Segerstrom-Heizer Mine, Mineral Basin Mining District, Pershing County, Nevada, USA
Grouping of sharp pyrite crystals replaced by goethite. This comes from the collection of Martin C. Jensen (b. 1959) of Reno, Nevada. Martin collected this on April 19, 2009. I acquired this from Weinrich Minerals (Dan Weinrich and Diana Weinrich - Grover, Missouri).
© Alexander Wong