Scaphites Ammonite | South Dakota smokey quartz flower-shaped mineral formation of Selenite

flower-shaped mineral formation of Selenite and sand that forms in arid

this mineral has a silky luster and soothing appearance

This item is 12” x 7” and weighs 40

these specimens are generally considered safe to handle because the radioactivity is trapped within the silica structure

semi-translucent calcite crystal that can be found in the Tri-State Mining District

Scaphites Ammonite | South Dakota smokey quartz flower-shaped mineral formation of SeleniteScaphites ammonites are extinct cephalopods known for their distinctive shells, featuring a tightly coiled juvenile stage that transitions into a straight, hook like adult body chamber. Found predominantly in Late Cretaceous marine deposits, these marine invertebrates had chambered shells for buoyancy, likely preyed on small organisms, and are important index fossils, with common South Dakota specimens showcasing iridescent shells and prominent ribs.