Goethite

Goethite

from the Upper Silurian age

Natural copper is relatively soft and often found in intricate and unique structures

occurring in shades of blue

fluorite specimens have been prized since ancient times and are now among the most popular minerals in the collecting world

roughly 20 million years ago

large calcite crystals and the dusting of fine gold from the pyrite is unique to specimens from this specific region of China and have not been found anywhere else

sometimes in the same formations

and is one of the more common gems although pieces of exceptional hue and clarity are considered fairly rare and can be extremely valuable

which means it naturally occurs in its metallic form

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

The unique combination of smoky

red and many other colors corresponding to their physical makeup and conditions when the mineral was formed