Quartz Photos
Cochise College               
Photos of Minerals
Geology Home Page

Roger Weller, geology instructor

wellerr@cochise.edu    copyright 2018-R.Weller

 
amethyst and citrine geodes-2

closer view of amethyst crystals converted to citrine
Brazil
Heating amethyst turns it yellow.
 

quartz-citrine                                                                                                                                                       6719
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.