In quarrying granite, a great deal of material is handled which is below the proper specifications for dimension stone, either because of size, incipient flaws, or discoloration. This material constitutes the grout and is thrown aside. In the past, there has been no market for this other than locally due to shipping costs, and indeed it has often been an encumbrance at the quarries. The use of a great deal of this waste, properly ground and graded, is not new, but it is only recently that a plant has been established in Texas. The Llano Granite Products Company manufactures poultry grit, and a steady market is being developed in Texas that utilizes about one carload of the finished product a week.

The mill is located near Llano in Llano County, Texas, at a gray granite quarry owned by G. A. Parkinson. The trade name of the poultry grit is Granitex. The mill has a capacity of a carload a day, and four sizes of crushed stone are milled.