惰质体是低氧低氢的类木炭物质。

Inertinities are charcoal-like substance with low oxygen and hydrogen contents.

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惰质组包括丝质体(化石木炭)、源自真菌残体的菌类体，以及含氢低、高反射率的其他高碳物质。

Inertinite includes fusinite (fossil charcoal), sclerotinite derived from fungal remains, and other high-carbon materials with a low-hydrogen content and a high reflectance.

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