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BORT, or BOART

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Originally appearing in Volume V04, Page 276 of the 1911 Encyclopedia Britannica.
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BORT, or BOART , an inferior See also:kind of See also:diamond, unfit for cutting but useful as an abrasive See also:agent. The typical bort occurs in small spherical masses, of greyish See also:colour, rough or drusy on the See also:surface, and showing on fracture a radiate crystalline structure. These masses, known in See also:Brazil as See also:bolas, are often called "shot bort" or "See also:round bort." Much of the bort consists of irregular aggregates of imperfect crystals. In See also:trade, the See also:term bort is extended to all small and impure diamonds, and crystalline fragments of diamond, useless as See also:gem-stones. A large proportion of the output of some of the See also:South See also:African mines consists of such material. This bort is crushed in See also:steel mortars to See also:form diamond See also:powder, which is largely used in lapidaries' See also:work.

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