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-1

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

quartz-citrine                                                                                                                                                       6718
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.