A Study of Andesine Matrix Specimens Purported to be from Tibet

Shane F McClure1, George R. Rossman2, Kenneth Scarrat3

1GIA Laboratory, Carlsbad, CA       2California Institute of Technoloty, Pasadena, CA    3GIA Research, Bangkok, Thailand


             During the investigation of red andesine from Tibet, several samples of what appeared to be andesine in matrix were provided. This article documents the examination of these specimens with the goal of proving of disproving their authenticity. Microscopic examination, Raman , LA-ICP-MS and ATR were used and the results are presented. The findiings strongly suggest these specimens are manufactured. 

ATR spectrum

Infared ATR spectra of the matrix near andesine with organid components compared to the matrix away from the andesine.