Transactions . y in the Klamath Moun- 1 Zeit. prak. geol. (1894) 2, 384-394- W. Lindgren: Mineral Deposits, 747. N. Y., 1913. McGraw-Hill. >2 F. W. Clarke: U. S. Geol. Survey Bull. 616, 3d edition, 344 122 lUXKXT STUDIES OK DOMKSTIC CHUOMITE DEPOSITS tains,^ vvliero, judging from the tiiin section, it appears to be associatedwith pink chrome chlorite, of secondary origin, derived fioni the altera-tion of the chrome diopside, which appears to be a primary part of therock structure. The rare occurrence of chrome diopside with chromiteis remarkable. Uvarovite occurs in well defined bright gree
Transactions . y in the Klamath Moun- 1 Zeit. prak. geol. (1894) 2, 384-394- W. Lindgren: Mineral Deposits, 747. N. Y., 1913. McGraw-Hill. >2 F. W. Clarke: U. S. Geol. Survey Bull. 616, 3d edition, 344 122 lUXKXT STUDIES OK DOMKSTIC CHUOMITE DEPOSITS tains,^ vvliero, judging from the tiiin section, it appears to be associatedwith pink chrome chlorite, of secondary origin, derived fioni the altera-tion of the chrome diopside, which appears to be a primary part of therock structure. The rare occurrence of chrome diopside with chromiteis remarkable. Uvarovite occurs in well defined bright green crystals at the RedLedge mine, 2 mi. southwest of Washington, in Nevada County, occurs in many other localities as a thin chrome-green coating, and isclearly of late secondary origin. Chrome chlorite was abundant in the surface portions of the largebody of chromite won at the Castle Crags mine in Shasta County, Calif.,and also in the Deer Creek mine, Wyo., where some good crystals 5W. REID BUTTEl NEL. A KILOMETERS Fig. 17.—la, Hornblende gneiss; streaks of black hornblende mingled WITH A smaller AMOUNT OF PLAGIOCLASE AND A LITTLE QUARTZ) IT CONTAINSDARKER BANDS OF No. 2. 6, HoRN^LENDE-PYROXENE ROCK, FORMING BANDS IN THEHORNBLENDE GNEISS) THE PYROXENE CONTAINS MANY INCLUSIONS OF , GnEISSOID PERIDOTITE, in THE BASAL PORTION OF WHICH ARE THIN LAYERS OFHORNBLENDE-PYROXENE ROCK. C, d, MaSSIVE OR SCHISTOSE-OLIVINE ROCK, CONTAIN-ING THE BELTS OF BANDED CHROME ORE (e) OF ReD BuTTE. occur lining cavities in the ore, evidently being secondary; so also is theassociated wolchonskoite. The banded ores of the Hamburg region of Siskiyou County, Calif.,throw an interesting hght upon the origin of chromite. A general section,Fig. 17, approximately northeast and southwest across Red Butte toScott River, disclosed the relation of the banded chrome ore to the under-lying gneiss,^ which is well exposed along the Scott River road for 6 ^^ The specimen was handed me by J. F.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
