Roger Weller, geology instructor
email@example.com copyright 2010-R.Weller
The most common crystal shape is the octahedron.
Photo is copyright free only for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.
specimens courtesy of Australian Mineral Mines
1672 Princess Hwy, Oakleigh East, 3166, Melbourne, Australia
(61) (3) 9544-5444