Transactions . nient Platk VI.—HhomMc .structure pcrscrvcd in ore due to icj)l:ic(I of dolomite, as i-hown in Plate IV. rpinr fut=A, lower cut = Ii. Replacement Ore-Bodies—Irving 435 left them in their original position. In consequence an examina-tion of siliceous ore without the polarizer will show the originaloutline of a foraminiferal test or dolomite rhomb as determined byminute unreplaceable particles of foreign matter, but the appli-cation of the polarizer shows that the place of the lime has beenentirely taken by silica. Original Rock Structures. Stratification.—All unaltered
Transactions . nient Platk VI.—HhomMc .structure pcrscrvcd in ore due to icj)l:ic(I of dolomite, as i-hown in Plate IV. rpinr fut=A, lower cut = Ii. Replacement Ore-Bodies—Irving 435 left them in their original position. In consequence an examina-tion of siliceous ore without the polarizer will show the originaloutline of a foraminiferal test or dolomite rhomb as determined byminute unreplaceable particles of foreign matter, but the appli-cation of the polarizer shows that the place of the lime has beenentirely taken by silica. Original Rock Structures. Stratification.—All unaltered sedimentary rocks are char-acterized by a division into layers or strata, which may vary inthickness from the thinness of paper to a hundred feet or more. When the beds are of great thickness no preservation of themin the ore mass is usually noticeable as the ore bodies are thenoften of less size than the individual beds or layers. When thelayers are thin they are found frequently preserved in oremasses.
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
