Opal Photos  (Jelly Opal)      
Cochise College                                                           
Photos of Gemstones
Transparent Gemstones
Virtual Geology Museum
Hall of Gemstones
Geology Home Page
Roger Weller, geology instructor                       

wellerr@cochise.edu

Opals (Jelly Opal)
last edited:  11/7/11    number of photos:  3                                                
Opal is SiO₂.nH₂O
hardness: 5.5 to 6.5
 

faceted opals

opal, faceted Mexican jelly opals:  A  B  C*

Photos are copyright free for non-commercial educational uses. 
Just credit photos to R.Weller/Cochise College.
copyright 2011-R.Weller