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  • (anthropology/archaeology) an "advanced" Preliminary stage in the manufacture of an artifact (also: "preform".)
  • (geology)
  1. An interval in a borehole from which core was not recovered or was lost, or in which no minerals of value were encountered. Long
  2. See: bit blank
  3. In powder metallurgy, a pressed, presintered, or fully sintered compact, usually in the unfinished condition and requiring cutting, machining, or some other operation to produce the final shape. ASM, 1
  4. A quartz plate with approx., or exactly, the correct edge dimensions, but not yet finished to final thickness (frequency). Ordinarily applied to pieces of quartz that are in the process of being machine lapped or that are diced out, but not yet lapped. Am. Mineral., 2
    Source: Dictionary of Mining, Mineral, and Related Terms


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