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One face has been polished at the tip of both sides of this crystal
5" Himalayan Quartz Crystal
It's often set in protective settings that shield it from wear
columnar calcite coated on one side by a 1/4" layer of quartz crystals
Natural Mintabie Opal on Sandstone
Marcasite Stalactite from Linwood Mine DX3178 dolomite One face has been polishedMarcasite 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
