White Cliffs opal fossils

Opalized fossil... Or unicorn horn...

Ammonite / This ammonite is on display in our Elements gallery. Herbert Art Gallery & Museum, Coventry, West Midlands, UK

Random Pictures Of The Day - 62 Pics

Helix Ramondi (land snail) epigenised in blue Lussatite Opal-CT - Dallet, Puy-de-Dôme, France

Opalized Theropod. Dinosaur Tooth. Opalized fossils form when silica settles into cracks in the bone, then harden into opal. photo Carl Bento. Australian Museum.

Rare Opalised Wood From Nevada Nevada is famous for its beautiful, colorful black Opal. The state contains some very rich precious opal bed...

Opal forms in cavities within rocks. If a cavity has formed because a bone, shell or pinecone was buried in the sand or clay that later beca...