Roger Weller, geology instructor
email@example.com copyright 2011-R.Weller
agate from Africa
Agate is a form of cryptocrystalline quartz. "Crypt" means hidden and the crystals
making up agate are submicroscopic in size, definitely hidden from view. Agate is
the form of cryptocrystalline quartz that displays banding. The bands may be thin
or thick and may vary dramatically in color due to the presence of iron and
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.