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单词 θ6575
释义
the world > the earth > minerals > types of mineral > hydrocarbon minerals > [noun] > coal > constituents of (4)
clarain1919

A kind of coal; an ingredient of coal (see quots.).

maceral1935

Any of the microscopic structural constituents of coal.

vitrinite1935

One of the three major kinds of maceral that go to make up humic coal, rich in oxygen and characteristic of vitrain.

lithotype1957

Geology. A macroscopically visible constituent of coal distinguished by its physical characterisitics; a macroscopically distinguishable variety of…

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