Emerald

Emerald

Ophiuroides sp

Aquamarine is a form of Beryl crystal long sought after as a gem and precious stone due to its beautiful blue-green hue and clarity

and as a precious metal for thousands of years

Malachite is known for its deep green coloration

Middle Devion period

This preglabellar ring (head shield) is covered in many sensory pits which may have held hairlike features when the trilobite was alive

which means it naturally occurs in its metallic form

It has a very dramatic "head shield" which is often interpreted as a mechanism to help it stay on top of a soft ocean floor

Paradoxides sp

A vivid and richly colored copper-based mineral

A widespread and industrially important mineral

Kataoua formation