Corundum Photos 
Cochise College               
Photos of Minerals
Geology Home Page

Roger Weller, geology instructor     copyright 2010-R.Weller 

corundum-ruby crystals-3
The red color in rubies comes from trace amounts of chromium as an impurity. 
Ruby crystals occur in hexagonal prisms which can either be long or short and


corundum                                                                                                                                        3
Photo is copyright free only for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.