Opal Photos                            
Cochise College                                                                                                          
Photos of Gemstones
Translucent Gemstones

Geology Home Page
Roger Weller, geology instructor                       


fire opal

last edited:  7/10/17    number of photos:  39
Opal is SiO2.nH2O
hardness: 5.5 to 6 

Also visit Cochise College
Photos of Opals
Black opal is where the back of a colorful, firey opal is made of a dark material that
emphasizes the colors in the top of the opal.


lectures on opal
Opal- Cake M. Janssen
Australian fire opal cabochons:  A  B  C  D
blue boulder opal from Australia: 

opal doublets:  A  B  C
Mexican jelly opal cabochons: 
A  B  C  D

Gilson synthetic opals:  A

blue opals-Arizona:  A

opals in jewelry

fire opal rings:  A

fire opal pendants:  A  B  C  D
blue opal pendant: 


opal, uncut

Australian fire opal:  A  B  C  D  E
polished Australian boulder opal:

Mexican fire opal:  A  B  C                                                                         

Mexican jelly opal:  A  B  C

dendritic opal from Brazil:  A  B

common opal, pink:  A

common opal, red:  A

common opal, dark red:  A

blue opal from Arizona:  A  B


Photos are copyright free for non-commercial educational uses. 
Just credit photos to R.Weller/Cochise College.
copyright 2017-R.Weller