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columnar calcite coated on one side by a 1/4" layer of quartz crystals
A plethora of quartz points of varying size cover the massive quartz underneath
D'Angers Region
Sitting on top of a lovely cluster of lepidolite and tourmaline in quartz
It's often set in protective settings that shield it from wear
Marcasite Stalactite from Linwood Mine DX3178 dolomite columnar calcite coated on oneMarcasite Stalactite from Linwood Mine Approx. Dimensions: 3x1. 25x1 inches Approx. Weight: 29. 6 grams Locality: Linwood Mine, Buffalo, Scott Co., Iowa, USA Marcasite specimens from the Linwood Mine (Buffalo, Scott County, Iowa, USA) are eye catching mineral pieces prized by collectors for their metallic luster and distinctive crystal forms. Marcasite is an iron disulfide (FeS?) mineral that crystallizes in tabular, spear like or stalactitic clusters
