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



Opals (Jelly Opal)
last edited:  11/10/17    number of photos:  3                                                

Opal is SiO2.nH2O
hardness: 5.5 to 6.5

Faceted opals are rare because the material is so brittle.

faceted opals

opal, faceted Mexican jelly opals:  A  B  C*


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Just credit photos to R.Weller/Cochise College.
copyright 2017-R.Weller