Herkimer Diamonds-Iridescent
                        from Herkimer County, New York                                   
Cochise College
Geology Home Page 
Roger Weller, geology instructor  
Herkimer Diamonds               

last edited:  3/30/18         2 views
Photos are copyrighted by Roger Weller,
but can be used copyright-free for non-commercial educational uses. 

iridescent fractures within Herkimer diamonds
   Fractures within Herkimer diamonds are extremely small planar openings that are wedge-shaped. 
Light entering into these fractures produces a rainbow of colors due to a phenomenon known as
"Newton's Rings".