. Bulletin - United States National Museum. Science. THE MINERALS OF IDAHO 201. in size from small rounded grains to pebbles a half inch or more in diameter. The tin pebbles as they occur on Panther Creek are sparsely distributed through the lower portion of a bed of gravels which varies from 4 to 20 feet in thickness. A specimen (Cat. No. 86,809, ) in the National Museum is labeled: "Stream wood tin from Prairie Basin, Lemhi ; It consists of waterworn pebbles up to cm. in size, of wood tin having the usual radiate fibrous structure and varying colors from pale bro
. Bulletin - United States National Museum. Science. THE MINERALS OF IDAHO 201. in size from small rounded grains to pebbles a half inch or more in diameter. The tin pebbles as they occur on Panther Creek are sparsely distributed through the lower portion of a bed of gravels which varies from 4 to 20 feet in thickness. A specimen (Cat. No. 86,809, ) in the National Museum is labeled: "Stream wood tin from Prairie Basin, Lemhi ; It consists of waterworn pebbles up to cm. in size, of wood tin having the usual radiate fibrous structure and varying colors from pale brown to dark brown, red brown, and black. OWYHEE COUNTY Cassiterite has been found in the Silver City district in placers. It is the variety known as wood tin and occurs in beautifully rounded masses from one-eighth to one-half inch in diameter. It was especially noted along Jordan SHOSHONE COUNTY Stream tin is reported to occur in the Coeur d'Alene ^ RUTILE (250) Titanium dioxide, Ti02 (or titanyl titanate, ). Tetragonal. BOISE COUNTY Rutile has been noted sparingly in black sands from a number of gold placers in Idaho. A steely lus- tered prismatic crystal 6 mm. long, found in the polycrase-bearing sand from Centerville, was iden- tified as rutile. The prismatic zone is deeply striated, the forms present being a(100), m(110), and 2(130). The crystal is terminated by the pyramid c(011). This crystal is shown in the drawing (fig. 36). It was peculiar in showing greenish internal reflections and when crushed and examined in transmitted light the color was yellowish green, a very unusual color for rutile. As emphasized under "zircon," some of the light colored crystals which have been described as that mineral may be rutile, the angles of rutile and zircon being so similar that very accurate measurements are necessary to distinguish between Please note that these images are extracted from scanned page images that may have been digitall
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
