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Books Books 1 - 2 of 2 on ... coating, which is probably due to the alteration of the weathered coal. The chief....
" ... coating, which is probably due to the alteration of the weathered coal. The chief impurities of the coal are sulphur balls and small lenses of pyrite that are scattered somewhat irregularly through the bed. The higher coals are also distinctly black,... "
Bulletin - United States Geological Survey - Page 130
by Geological Survey (U.S.) - 1910
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Congressional Serial Set

United States - 1909
...which is no doubt due to the alteration of the weathered coal. The chief impurities of the coal are the sulphur balls and small lenses of pyrite that are...from the mine. They show more traces of iron stain and contain considerable gypsum and salt flakes in the joints or bedding planes. On exposure to the...
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Contributions to Economic Geology, 1908: Mineral fuels, Part 2

Marius Robinson Campbell - Coal - 1910 - 559 pages
...shipping without breaking down. On burning it produces no clinker and leaves a small bulk of red- white or reddish ash. Samples taken from surface prospects...more traces of iron stain than the Rock Springs coal and contain considerable gypsum and salt flakes in the joints or bedding planes. On exposure to the...
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