Roger Weller, geology instructor
email@example.com 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.
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
P.O. Box 50548, Santa Barbara, California 93150