 | | Journal (article/letter/editorial) | | of calcic plagioclase (An85–90) and aluminous amphibole (pargasite-magnesiohastingsite). The lenses, interpreted...strongly influence the formation of corundum + amphibole from the initial magmatic assemblage of anorthite...(to ~6 kbar and ~600 °C) that affected the entire belt (Raith et al. 1999; Ghosh et al. 2004; Chowdhury...MEGACRYSTIC ANORTHITE, FROM GTSI bands rich in amphibole. Locally, plagioclase lenses up to ~5 cm long...in the matrix consisting of smaller grains of amphibole and plagioclase (Fig. 2). The plagioclase lenses |  | | Journal (issue) | | appears to be part of a largescale jade formation belt in southern China. 216 Evidence of Rotation in...• Inclusion-rich black topaz from the Thomas Mountains, Utah • Quarterly Crystal: Dioptase in and on...system • Trapiche quartz • Rubies from Rock Creek, Montana • Glass-filled polki-cut CVD synthetic diamonds...E. Kane James E. Shigley London, UK Helena, Montana Carlsbad, California John L. Emmett Stefanos...Mouawad Campus 5345 Armada Drive Carlsbad, CA 92008 USA © 2019 Gemological Institute of America All rights |  | | Journal (issue) | | presentations and special reports|GIT Lab Updates|USA lifts ban on Burmese ruby and jadeite|Margaritologia...inclusions|Clinohumite from Vietnam|Lace opal from Utah, USA|Pollucite from Pakistan with polylithionite inclusions|Large...Edward Boehm, RareSource, Chattanooga, Tennessee, USA; Maggie Campbell Pedersen, Organic Gems, London;...Emmett, Crystal Chemistry, Brush Prairie, Washington, USA; Emmanuel Fritsch, University of Nantes, France;...E. Post, Smithsonian Institution, Washington DC, USA; Andrew H. Rankin, Kingston University, Surrey; George |
|
