Monazite, a phosphate of thorium and other rare earths, contains on the average about i cc. per gram.
If thorianite cannot be obtained, monazite, which is more abundant, may be utilized.
Under all these three conditions the diamond is associated with fragments of the rocks of the country and the minerals derived from them, 'especially quartz, hornstone, jasper, the polymorphous oxide of titanium (rutile, anatase and brookite), oxides and hydrates of iron (magnetite, ilmenite, haematite, limonite), oxide of tin, iron pyrites, tourmaline, garnet, xenotime, monazite, kyanite, diaspore, sphene, topaz, and several phosphates, and also gold.
CERIUM (symbol Ce, atomic weight 140.25), a metallic chemical element which occurs with the rare earths in the minerals cerite, samarskite, euxenite, monazite, parisite and many yttrium minerals.
Minerals developed slightly, or not at all, are granite, valued at $1500 in 1905; surface salt, in the arid and semiarid regions; nickel and cobalt, in Lemhi county; tungsten, near Murray, Shoshone county; monazite and zircon, in certain sands; and some pumice.
The value of other minerals produced in 1908 was as follows: Granite, $297,874; clay, $110,636; and monazite, $ 1 3,4 4.