1. Term used to designate extent to which metamorphism has advanced. Compare with grade. Rank is more commonly employed in designating stage of metamorphism of coal.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
     
  2. a. Describes the stage of carbonification attained by a given coal. IHCP
    b. The place occupied by a coal in a classification. Specifications of the American Society for Testing and Materials cover the classification of coals according to their degree of metamorphism, or progressive alteration, from lignite to anthracite. For a complete description of this classification, consult ASTM Designation: D 388. ASTM
    c. When applied to coal, denotes its age in geological formation, not necessarily denoting quality. BCI
    d. The position of a coal relative to other coals in the coalification series from brown coal (low rank) to anthracite (high rank), indicating its maturity in terms of its general chemical and physical properties. BS, 11
    e. Those differences in the pure coal material due to geological processes designated as metamorphic, whereby the coal material changes from peat through lignite and bituminous coal to anthracite or even to graphite. AGI
    f. All coallike fossil fuels form a continuous and progressive series, ranging from lignite, through the various bituminous coals, to anthracite. It is the position of a particular coal in this series that determines its rank. Therefore, lignite is a low-rank coal while anthracite is a high-rank coal. See also: coalification; grade; Hilt's Law; coal rank. Nelson
    g. A term primarily devised to indicate the position of a fuel in the series peat-anthracite, probably best measured by the percentage of carbon (ashless, dry basis). Thus rank depends on the degree of metamorphism of coal, and increase of rank is, in general, marked by the decrease of volatiles and moisture. Tomkeieff
    h. The term rank may also be applied to other series, such as the sapropelic coal series or the bitumen series. CF: type Tomkeieff
    Source: Dictionary of Mining, Mineral, and Related Terms











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