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Encyclopedia Britannica



BORT, or BOART

This article appears in Volume V04, Page 276 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BLA-BOS
BORT, or BOART , an inferior
kind
  of diamond, unfit for cutting but useful as an abrasive
agent
 . The typical
bort
  occurs in small spherical masses, of greyish colour, rough or drusy on the surface, and showing on fracture a radiate crystalline structure. These masses, known in
Brazil
  as bolas, are often called "shot
bort
 " or "
round
  bort." Much of the bort consists of irregular aggregates of imperfect crystals. In
trade
 , the
term
  bort is extended to all small and impure diamonds, and crystalline fragments of diamond, useless as gem-stones. A large proportion of the output of some of the
South
 
African
  mines consists of such material. This bort is crushed in steel mortars to form diamond powder, which is largely used in lapidaries'
work
 .


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