Yuko Shiratori conducted an analysis of 1,126 obsidian blades and flakes from Tayasal and Nixtun-Ch’ich’ using a Bruker portable X-ray Fluorescence (pXRF) device. She is working with Nathan Meissner and Timothy Pugh to publish the results.
CLICK HERE for a 3D visualization of her results.
Nathan Meissner conducted a pXRF analysis of several hundred Postclassic side-notched projectile points. His results are published in his dissertation.
A good summary of pXRF can be found on the website of The Field Museum.