Marcasite Stalactite from Linwood Mine DX3178 dolomite Sitting on top of a

Sitting on top of a lovely cluster of lepidolite and tourmaline in quartz

Natural Mintabie Opal on Sandstone

It's often set in protective settings that shield it from wear

One face has been polished at the tip of both sides of this crystal

rich color and are partially coated in chalcopyrite crystals

Marcasite Stalactite from Linwood Mine DX3178 dolomite Sitting on top of aMarcasite 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