Cryolite
Videos
Cryolite is a rare mineral identified with the once-large deposit at Ivittuut on the southwest coast of Greenland, mined commercially until 1987.
Cryolite from Ivittuut, Greenland
Peter Christian Abildgaard
The cryolite mine at Ivigtut, Greenland, summer 1940
Bauxite
Videos
Bauxite is a sedimentary rock with a relatively high aluminium content. It is the world's main source of aluminium and gallium. Bauxite consists mostly of the aluminium minerals gibbsite, boehmite, an
Reddish-brown bauxite
Bauxite with US penny for comparison
Bauxite with core of unweathered rock
One of the world's largest bauxite mines in Weipa, in northern Queensland, Australia