Roger Weller, geology instructor
firstname.lastname@example.org copyright 2010-R.Weller
red spinel crystals-1
Spinel crystallizes in the Isometric system and usually forms octahedron crystals.
Spinel has a hardness of 8 and occurs in a wide range of colors.
Clear, colorful forms of spinel are faceted for jewelry.
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.