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Poorman Formation, Homestake Mine Ore Specimens [199453]

Currency:USD Category:Collectibles / Rocks, Fossils & Minerals Start Price:40.00 USD Estimated At:80.00 - 150.00 USD
Poorman Formation, Homestake Mine Ore Specimens [199453]
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Three specimens of the Poorman Formation at Homestake showing pyrite mineralization inside of the folds. Spectacular! Please see photos for dimensions. The Poorman Formation underlies the Homestake Formation and is composed of an upper sequence of sericite to biotite-dominant carbonate quartz and graphitic phyllites and a lower sequence of hornblende-plagioclase schist of tholeiitic affinity. Shows intense folding.
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Date:
Country (if not USA):
State: South Dakota
City: Lead
Provenance: Homestake Mine Geologist Dave Shaddrick Collection