Fluorite Phantom Sphalerite Metacanthian Trilibite from the Mid

Metacanthian Trilibite from the Mid Devonian Period

and when exposed to the elements over a long period of time can change into the closely related malachite

Amethyst is a form of Quartz which gets its beautiful purple tint from the substitution of silicone for iron due to irradiation

which over the course of millions of years becomes solid while retaining the semitransparent yellowish hue of tree sap

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

Fluorite Phantom Sphalerite Metacanthian Trilibite from the Mid