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By Clarence Karr

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0145 mm. thick, small irregularly shaped particles, and aggregated masses of closely packed particles. Re­ sembles anthraxvlon in color, w hich varies to th e sam e degree. D erived from th e parts of plants similar to th e parent material of anthraxylon, subjected to intense biochemical degrada­ tion, which destroyed struc­ tural evidence of original plan t forms. Brown m atter. _ Occurs closely associated with opaque m atter and translucent hum ic m atter; resembles these in general appearance except for its sem itranslucency and ab­ sence of granular structure a t high magnification.

Maximum Reflectance, R max Maximum reflectance is measured on a polished surface of coal mac­ eral, commonly vitrinite, using a polarized light source. The light re­ flected from the specimen passes through a monochromatic green filter, 546 ± 5 nm, placed between the specimen and the photometer, before it strikes the cathode of the photomultiplier tube. A scanning monochromator may be used in place of the filter. After the particular maceral grain to be measured is centered, rotate the circular stage slowly for 360° and record the maximum reading on the photometer recorder.

Sh ig o , J. , and A ikm an , R. P. (1968). Fuel 4 7 ,1 2 5 - 1 4 3 . B ow ie, S. H. U. (1967). In "P hy sical M ethods in D eterm inative M in eralog y " (J. ). A cadem ic Press, N ew York. , and Berry, W. F. (1965). Preparation and P olishin g of Coal and Coke for Petro­ graphic A nalysis. , M onroeville, P ennsylvania, van G ijzel, P. (1971). In "S p o ro p o lle n in " (J. ). A cadem ic Press, New York. , and Virgos, J. M. (1977). J. Microsc. 109, 2 3 -2 8 . International C om m ittee for Coal Petrology (ICCP) (1963).

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