1. Volcanic fragments of sharply angular glass particles, smaller than cinders. See also volcanic ash.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
     
  2. a. The inorganic residue after burning, esp. of coal. Ignition generally alters both the weight and the composition of the inorganic matter. See also: ash yield; extraneous ash; inherent ash. AGI
    b. Fine pyroclastic material (under 2.0-mm diameter; under 0.063-mm diameter for fine ash). The term usually refers to the unconsolidated material but sometimes is also used for its consolidated counterpart, tuff. Syn: dust; volcanic ash; volcanic dust; pumicite. AGI
    c. Inorganic residue remaining after ignition of combustible substances, determined by definite prescribed methods. ASTM
    Source:
    Dictionary of Mining, Mineral, and Related Terms











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