Wulfenite, 9.4 cm, from the Defiance mine near Gleeson, Cochise County, Arizona. Collected in 1957, sold in 1958, by Filer’s Minerals; ex collection of Mike Groben (1928–2015). Jeff Scovil photo.
Defiance Mine, USA: a renowned Arizona wulfenite locality famed for thin, lustrous butterscotch plates with calcite, prized by collectors for texture and color.
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