A hard, lustrous type of coal or coal component that is dull black and breaks with a smooth, shell-like surface.
From Latin 'durus' (hard) plus the suffix '-ain.' A geological term coined to describe a specific maceral (distinct component) in coal.
Coal isn't just one substance—it's made of different microscopic components like 'durain' with different properties, and geologists can identify types of ancient plants by studying coal's composition!
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