Attritus

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  1. A composite term for dull gray to nearly black coal components of varying maceral content, unsorted and with fine granular texture, that forms the bulk of some coals or is interlayered with bright bands of anthraxylon in others. It is formed of a tightly compacted mixture of altered vegetal materials, esp. those that were relatively resistant to complete degradation. CF: attrital coal introduced by R. Thiessen in 1919. AGI
  2. Thin bands of dull coal interlaminated with the bright, glossy coal bands called anthraxylon. Microscopically it consists of intimately mixed, tightly compacted remains of varied morphological form and origin. Attritus is a collective term, not directly comparable with any one of the microlitho types of the Stopes-Heerlen nomenclature but consists of an intimate association of varying proportions of macerals of the vitrinite, exinite, and inertinite groups. It is present in practically all types of coal. In bright-banded coal it is secondary in importance to anthraxylon, but in splint coal it is the dominant component, and nonbanded attrital coals consist entirely of attritus. IHCP
  3. The dull-gray to nearly black, frequently striped portion of material that comprises the bulk of some coals, and the alternating bands of bright anthraxylon in well-banded coals. It was derived from all sorts of comminuted and macerated plant matter, esp. from the plants that were more resistant to complete decomposition. It consists of humic degradation and opaque, charred, resinous, and mineral matter; fats, oils, waxes, cuticles, spores, arid spore exines, and other constituents of the plants forming the coal. AGI
  4. Coal components consisting of a mixture of microscopic fragments of vegetable tissues. It is classified into opaque attritus and transparent attritus. Generally, it corresponds to cull coal or durain. Tomkeieff
    Source: Dictionary of Mining, Mineral, and Related Terms


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