This beautiful specimen of a phosphophyllite group with gemmy portions has lustrous faces and a green hue. The phosphophyllite, which is a rare zinc-iron...
This large cabinet specimen of arsenopyrite was discovered in the polymetallic deposits of Panasquiera Mine, Castelo Branco District, Portugal. The striking iridescence to the...
The presence of cobalt in erythrite is what brings forth the brilliant reddish-purple color so often visible in this mineral.
In this specific specimen, the...