Lead District, Lawrence Co., South Dakota, USA

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Cummingtonite : [ ][Mg₂][Mg₅][(OH)₂\|Si₈O₂₂], Arsenopyrite : FeAsS - (Fe_0.90Co_0.10)AsS
	Lead District, Lawrence Co., South Dakota, USA University of New Mexico Geology Museum specimen. P. Cristofono photo.
© 2008 Peter Cristofono	Photo ID: 154647 View Count: 147
Gold : Au, Quartz : SiO₂
	Homestake Mine, Lead District, Lawrence Co., South Dakota, USA A .5mm group of crystals on and in quartz. Photographed by, and in the collection of, Karl Volkman. Ex Donald Volkman Collection.
© Karl Volkman 12/05	Photo ID: 45538 View Count: 301
Gold : Au
	Homestake Mine, Lead District, Lawrence Co., South Dakota, USA A 2mm area of gold in matrix. photographed by Karl Volkman. In the collection of Donald Volkman
© Don Volkman 04/06	Photo ID: 54708 View Count: 232
Gold : Au
	Homestake Mine, Lead District, Lawrence Co., South Dakota, USA Width of photo approximately 4 mm. 7400 Level, collected November, 1985. Photo: Ralph Thomas
© Stephen E. Fritz	Photo ID: 134545 View Count: 123
Gold : Au, Quartz : SiO₂
	Homestake Mine, Lead District, Lawrence Co., South Dakota, USA Gold - an approx 10 x 4 mm gold leaf on the surface of a 5 x 4 x 4 cm quartz and schist matrix. See additional photos and J. H. Marshall label.
© Christopher O'Neill	Photo ID: 196288 View Count: 90
Gold : Au
	Homestake Mine, Lead District, Lawrence Co., South Dakota, USA From the 5450 Level, 12-ledge of the Homestake Mine, this specimen hosts numerous small patches of brilliant Native Gold on a smartly contrasting matrix. Specimen size is 2.78cm x 2.5cm x 1.02cm.
© Jasun McAvoy	Photo ID: 261158 View Count: 9
Pyrite : FeS₂
	Homestake Mine, Lead District, Lawrence Co., South Dakota, USA Pyrite crystals. FOV is 5 mm. Photo by Steve Stuart. Specimen resides in his collection. Label says "pyrite on rhyolite".
	Photo ID: 28828 View Count: 328
Pyrite : FeS₂
	Homestake Mine, Lead District, Lawrence Co., South Dakota, USA Pyrite crystal of pyritohedral form. Field of view is 2.5 mm. Photo by Steve Stuart. Specimen resides in his collection.
	Photo ID: 28823 View Count: 287
Pyrite : FeS₂
	Homestake Mine, Lead District, Lawrence Co., South Dakota, USA Pyrite crystal with complex faces. FOV is 2.5 mm across. Photo by Steve Stuart. Specimen resides in his collection.
	Photo ID: 28825 View Count: 260
Quartz : SiO₂, Pyrite : FeS₂, Ankerite : Ca(Fe²⁺ ,Mg,Mn²⁺)(CO₃)₂
	6350 Level, Homestake Mine, Lead District, Lawrence Co., South Dakota, USA 5.6 x 2.1 x 1.5 cm. A very unusual specimen from South Dakota for the quartz collector, and pretty too! This is a water-clear and gemmy quartz crystal included with and wrapped by a garland of iridescent pyrite flashing red and purple hues. Ex. Tom Campbell collection.
© Rob Lavinsky	Photo ID: 118562 View Count: 109