a. Term for the microlithotype consisting principally of the following groups of macerals: inertinite (micrinite, fusinite, semifusinite, and sclerotinite) and exinite, particularly sporinite. Durite contains at least 95% inertinite and exinite. The proportions of these two groups of macerals may vary widely, but each must be greater than the proportions of vitrinite and neither must exceed 95%. Durite E and durite I connote durites rich in exinite and inertinite, respectively. It is found in many coals, in fairly thick bands, principally in durains and the duller type of clarain, generally common. IHCP
b. A coal microlithotype that contains a combination of inertinite and exinite totalling at least 95%, and containing more of each than of vitrinite. CF: durain
Source:
Dictionary of Mining, Mineral, and Related Terms












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