gems, garnet, topaz, turquoise, quartz, opal, jade, chalchuitl, obsidian, pyrite, calcite, onyx, amber, Mexico

Sinkankas: Also published separately (39 pages, in cloth) and nearly identically reprinted in Comptes Rendus, International Geological Congress, Mexico City, 1907 (see reference). The work compiles various pieces of information from the literature on Mexican gemstones, including garnet, topaz, turquoise, quartz gemstones, opal (with a thorough discussion), chalchihuitl (jade-like stones of the Pre-Columbian inhabitants, covered in an extended essay), obsidian, pyrite, calcite onyx, and amber. It also contains substantial archaeological information. At the time of publication, this was the only significant paper on Mexican gemstones. The work is discussed on pages 568–569 of the referenced journal. LC 33-37061.