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Super-reduced mineral assemblages in “ophiolitic” chromitites and peridotites: the view from Mount Carmel
QING XIONG, WILLIAM L. GRIFFIN, JIN-XIANG HUANG, SARAH E.M. GAIN, VERED TOLEDO,
NORMAN J. PEARSON and SUZANNE Y. O’REILLY
European Journal of Mineralogy 29, 557-570.

    This paper gives a summary of the genetic model for the Mt. Carmel gem-bearing volcanic system and especially the origins of its remarkable suite of super-reduced (low oxygen fugacity) minerals. It then compares this suite to the super-reduced mineral association that has been found in several ophiolite occurrences, both in Tibet and the Polar Urals, and concludes that these occurrences reflect processes like those that have produced the Carmel Sapphire and other reduced minerals in the Mt Carmel volcanics. It also draws attention to the occurrence of this suite of minerals in explosive volcanoes on the Kamchatka Peninsula (NE Russia) and suggests that these processes may be more widespread than previously realized.

The European Journal of Mineralogy is the combined outlet for several mineralogical and geochemical societies in Europe. It is widely read and cited. This article was named as the Editor’s Choice for 2017 and will be available on Open Access for one year. 
     
  Super-reducing conditions in ancient and modern volcanic systems: implications for the carbon budget of the deep lithosphere
William L. Griffin, Sarah E.M. Gain, Jinxiang Huang, Yoann Greau, Vered Toledo and Suzanne Y. O’Reilly
Extended Abstract, 11th International Kimberlite Conference, Gabarone, Botswana
    This was presented as a talk at the recent (August 2017) IKC. It reproduces a summary of the genetic model from Mt Carmel, and then speculates about the effects of similar processes in cratonic areas. It suggests that the presence of moissanite (SiC) in kimberlites, diamonds and eclogite xenoliths reflects the introduction of mantle-derived CH4 + H2 fluids into the deep lithospheric mantle.

The International Kimberlite Conferences have been held each 4-5 years since 1973, in different localities around the world. They represent the peak gathering of researchers working on the mantle, kimberlites and related rocks, and diamonds. Industry is always represented. The proceedings from each conference have been published as books or special volumes of leading journals. This long abstract will be written up into a paper for the proceedings volumes.


 

Deep-earth methane and mantle dynamics:
insights from northern Israel, southern Tibet and Kamchatka

William L. Griffin, Sarah E.M. Gain, David T. Adams, Vered Toledo, Norman J. Pearson and Suzanne Y. O’Reilly

     
  Natural Moissanite Properties and Terrestrial Occurrence
Griffin, W. L., Toledo, V., Gain, S.E.M., Huang, J-X.
     
  Deep carbon: SiC in mantleand mantle-generated rocks
JIN-XIANG HUANG, W. L. GRIFFIN, L.MARTIN, V.TOLEDO, S. Y. O’REILLY
     
  Article: Record-Size Natural Moissanite Crystals Discovered in Israel
GIA, GEMS & GEMOLOGY, SUMMER 2014 (AUGUST 2014), VOL. 50, NO. 2
Author: Emmanuel Fritsch, Vered Toledo, and Antoinette Matlins
     
  MOISSANITE UNEARTHED IN ISRAEL SHATTERS RECORDS
Accredited gemologists have examined a series of crystals unearthed along the Kishon River in northern Israel and, confirming the belief of the firm that harvested them, declaring them to be moissanite. The Gemological Institute of America used Raman spectroscopy to analyze 30 crystals of various sizes and shapes found by the firm Shefa Yamim and have confirmed that they are natural moissanite, making the largest of them also the largest naturally-occurring moissanite ever found anywhere in the world.
     
 

Moissanite: The Post-Patent Era
What will it mean when new brands of moissanite come to market?

 


 

  

 

 

Natural Moissanite 4.1mm
 New "World Record"

 

August 19, 2012: 
New Moissanite "Jewish News One" Site

 

 

 

 

     

    


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