Photos of Opals
Cochise College    
Opals- Rough Opal and Specimens
Geology Home Page

Roger Weller, geology instructor

wellerr@cochise.edu     copyright 2012-R.Weller

 
common opal-10

Dark patches are manganese dendrites. 

opal                                                                                                                                                                                   1612
Photo is copyright free for non-commercial educational uses. 
Just credit photo to R.Weller/Cochise College.