Quartz Photos
Cochise College               
Photos of Minerals
Virtual Geology Museum      Hall of Minerals

Geology Home Page

Roger Weller, geology instructor

wellerr@cochise.edu    copyright 2008-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
manganese oxides.


quartz
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.