The ore deposits of Utah . A. SPECIMEN OF ROCK FROM THE OPHIR HILL MINE, SHOWINC; ALTERATION OF LIMESTONE THAT CONTAINS ORE DEPOSITS. Layers containing crystals of pyrite are composed largely of epidote with orthoclase and quartz; intervening bandscomposed largely of quartz and orthoclase. Two-thirds natural £. PHOTOMICROGRAPH SHOWING GRADATION FROAl EPIDOTE LAYEH TO QUARTZ-OHTIIOCLASE LAYER. Lower right area, mainly epidote; central band, mainly quartz and grains of pyrite; upper left area, quarU and orthoclase wiUisome epidote. Enlarged 30 diameters. a > X u El ?< P5U «! P4P CO
The ore deposits of Utah . A. SPECIMEN OF ROCK FROM THE OPHIR HILL MINE, SHOWINC; ALTERATION OF LIMESTONE THAT CONTAINS ORE DEPOSITS. Layers containing crystals of pyrite are composed largely of epidote with orthoclase and quartz; intervening bandscomposed largely of quartz and orthoclase. Two-thirds natural £. PHOTOMICROGRAPH SHOWING GRADATION FROAl EPIDOTE LAYEH TO QUARTZ-OHTIIOCLASE LAYER. Lower right area, mainly epidote; central band, mainly quartz and grains of pyrite; upper left area, quarU and orthoclase wiUisome epidote. Enlarged 30 diameters. a > X u El ?< P5U «! P4P CO < o oo OO
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
