A large crystal of yellow fluorine-rich ellestadite to 1.5 cm, trapped in beautiful blue calcite. These are common enough as microcrystalline material from this locality, but few crystals of such size (and in good condition) are found. Quite exceptional for the species. Although still collected, I have seen many years' worth of material found here on sporadic trips by friends, and I can say crystals like this are superb and rare. NOTE: Texas Industries is the current owner of Riverside Cement and the cement plant there has been shut down since a week before Christmas 2008.