agatized cells

Agatised dinosaur bone

A core of amethyst (purple quartz coloured by iron) and an outer layer of white agate have filled in the marrow cavity in the centre of a thin slice of backlit dinosaur bone from the Smithsonian’s National gem Collection. Further white agate has replaced the cellular structure of the bone around the cavity, showing us its internal workings.

Loz

Image credit: Chip Clark