A beautiful blue-green variety of microcline feldspar, Amazonite is prized by collectors...
Shelled cephalopods that died out many years ago, the fossils of ammonites...
Apatite is a group of common phosphate minerals and is popular with...
Aquamarine ranges from pale-blue to light-green and is a variety of the...
Celestine is prized for its delicate blue color. It is found in...
