Large 10 inch Quartz Crystal plate matrix, with Pyrite and Dolomite/Ankerite.  Homestake Mine Lead South Dakota.
Weighs___________Measures______________As shown in the photos and/or video
Extremely rare to get a fine crystallized mineral specimen from the Homestake mine, only certain geologists were allowed to take samples out, and they are hard to find to say the least.  Comes with the label shown as provenance, from the Black Hills Institute Museum.  I've had this as part of my Homestake collection for many years now.  Huge 10+ inch long piece.