Aragonite 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 

 
red aragonite crystals-1
Morocco
Aragonite has the same chemical composition as calcite, calcium carbonate, but
it crystallizes in the Orthorhombic system.  Instead of creating three-sided or
six-sided crystals such as calcite, aragonite produces box-like crystals.  However,
aragonite has the unique habit of forming triplets of Orthorhombic crystals joined
together in a shape that appears at first glance to be a hexagonal prism.  Close
examination of the prism faces show that some of the prism faces are not flat but
consist of two crystal faces coming together at an angle close to 170 degrees,
resulting in an indentation on the prism face.
 

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