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PhotosMagnetite - Peridot Mesa, San Carlos, San Carlos Indian Reservation, Gila Co., Arizona, USA

20th Jan 2014 19:45 UTCRichard Gunter Expert

03223290014977562858202.jpg
Peridot, Hercynite
Peridot Mesa (Peridot occurrence 38), San Carlos, Gila County, Arizona, USA
Copyright © Rockpick Legned Co. & Rick Dalrymple
There are several sets of analyses that indicate the average Spinel (sl) phase in the lherzolite inclusions from Peridot Mesa falls in the Hercynite field rather than Magnetite (Mg:Fe approximately 3:1). Is this sample a special case?

20th Jan 2014 20:24 UTCAlfredo Petrov Manager

Hello Richard, Do you have a reference or a copy of one of those analyses, so we can add hercynite to the species list for the locality?

20th Jan 2014 22:00 UTCRichard Gunter Expert

Hi Alfredo:


The reference is:


Uchida et. al (2005): Single Crystal x-ray diffraction of spinels from the San Carlos Volcanic Field: Spinel as a geothermometer: American Mineralogist v. 90 p. 1900-1908.


Dr. Uchida's PhD thesis is also on the net through the U. of A and gives chemistry of not only the Spinel Group phase but also the co-existing Forsterite and Clinopyroxene.


It makes a good study of non-end member compositions in all three co-existing phases.

20th Jan 2014 23:05 UTCAlfredo Petrov Manager

Thanks, Richard.
 
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