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Phil, Here is the source for Oklahoma no. 1 sand that we use in our physical modeling lab: http://tsmaterials.com/ --Kevin ************************************************************ Kevin J. Smart, Ph.D., P.G. Manager, Department of Earth, Material, & Planetary Sciences Geosciences & Engineering Division Southwest Research Institute San Antonio, TX 78238-5166 USA Phone: (210) 522-5859; Email: [log in to unmask]<mailto:[log in to unmask]> geoscience.swri.org<http://www.swri.org/4org/d20/home/what/eed.htm> From: Tectonics & structural geology discussion list [mailto:[log in to unmask]] On Behalf Of Resor, Phillip Sent: Thursday, October 29, 2015 9:52 AM To: [log in to unmask] Subject: Where to purchase sand for analog modeling - USA Hello All, I am adding sandbox modeling experiments to my structural geology course this year and am struggling with where to find appropriate sand (well sorted, fine-grained). I have seen "play sand" suggested online, but everything that passes as play sand around here is quite poorly sorted. I think perhaps the only requirement is that it is washed. Thanks for any suggestions you may have. Best, Phil Resor Wesleyan University