bortz

See also: Bortz

English

Alternative forms

Noun

bortz (uncountable)

  1. Diamond of inferior quality, commonly used for drill tips; abrasive diamond powder; bort.
    • 1906 September, X-Rays and a Diamond Thief, Popular Mechanics, page 932,
      It is also noticeable that the black diamond, No. 20, a dull and lusterless substance, is as transparent to the X-rays as the brilliants, while the diamond bortz, No. 6, is much less transparent than either, though more so than the imitation, No 19.
    • 1939, Materials Engineering, volume 10, page 358:
      These main categories of industrial diamonds, gem stones, bortz, and carbonados, are further subdivided into smaller classes. For instance, particularly fine bortz of a round form composed of crystals radiating from a common center are known as ballas.
    • 1951, James Deans Cumming, Diamond Drill Handbook, page 482:
      A large part of the production of the Belgian Congo is crushing bortz.
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