Rudist Bivalve Fossil | Saudi Arabia | Late Cretaceous titanium Bornite is a copper-iron sulfide

Bornite is a copper-iron sulfide mineral also known as “peacock ore” for its striking iridescent tarnish (blues

Formed as a secondary copper mineral

They’re not crystals

is the mineral calcium fluoride (CaF2)

This specimen is sourced from coarse-grained pegmatite deposits in Minas Gerais

Rudist Bivalve Fossil | Saudi Arabia | Late Cretaceous titanium Bornite is a copper-iron sulfideRudist bivalves are an extinct marine mollusk that operated as major reef builders in the Late Cretaceous. Their shell structure was heteromorphic, they often possessed a thick, calcitic attached valve and a smaller free upper valve. While rudists themselves are known for their strange and varied shapes, some groups within this subclass exhibit homeomorphic evolution, where unrelated species evolved similar, often parallel forms. This item is 8 x 4