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

Roger Weller, geology instructor     copyright 2012-R.Weller

fire opal within a lava ball-2
Boi Morto Mine, Pedro Segundo, Brazil
The outer surface of the lava ball is smooth, but where the surface is broken
the basalt is vesicular.

opal                                                                                                                                                 672b

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

Opal specimen courtesy of Opex Opal
Specializing in precious opals and opal jewelry
Dagbjorn Johnson
P.O. Box 50548, Santa Barbara, California 93150