----------------------+------------+-----------+-----------+ |Rio | | | |San Pedro. |Camp |Rio Gila. | | |Grant. | | ----------------------+------------+-----------+-----------+ Predominating rock |Granite and |Granite. |Basalt and | |rhyolite. | |rhyolite. | Sand | 14.00 | 61.20 | ... | Silt, with some clay | 75.40 | 34.07 | 92.26 | Potassa | 0.401 | 0.131 | 0.242 | Soda, | 0.051 | 0.014 | 0.039 | Lime | 4.356 | 1.998 | 1.798 | Magnesia | 1.019 | 0.203 | 0.570 | Alumina | 6.850 | 2.304 | 2.311 | Oxide of iron | | | | Phosphoric acid | 0.213 | 0.095 | 0.214 | Sulphuric acid | Trace. | 0.010 | Traces. | Hydroscopic water | 6.09 | 2.80 | 4.98 | Chemically-bound | | | | water and | | | | organic matter | 4.51 | 1.93 | 2.76 | Insoluble in | | | | hydrochloric acid | 71.10 | 87.52 | 84.85 | ----------------------+------------+-----------+-----------+ Among the secondary precious stones that have been found in Arizona are black and green tourmalines, peridots, beautiful garnets of every tint, bloodstone, jaspers and agate of every character, while fire and white opals are found in certain localities. Zircona, in crystals, very minute, of the cube form, and in masses, has been discovered. Sufficient vein matter has not been found to determine any rich deposit of fine crystals. =Tabular Statement of Indian Affairs in Arizona=, Showing Population, Products, Stock, Education, etc., on the several Reservations, including the Navajo.