Specimens of naturally occurring solid hydrocarbons were subjected to x-ray study in an attempt to determine whether inherent structural differences existed sufficient to provide a basis of classification. The hydrocarbon specimens included: Kentucky asphalt, gilsonite, asphaltum, grahamite, and albertite in addition to several unidentified specimens. Abraham (1938) classifies gilsonite and grahamite as asphaltites and albertite as an asphaltic pyrobitumen. The names used herein are those given by the contributor; the writer made no effort to identify those supplied without names.
Technique.—Slivers of the solid hydrocarbons, 1–2 mm.×7–10 mm., were cut, chipped, or ground from larger blocks. Each sliver was...
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