Variation of diamond (powder end particles), applied in abrasives, polishing agents, lubricants and on drilling & cutting tools/machinery.
1How does that tie in with the alteration of 'bort' to 'dort'?
2A bit of diamond bort, or even a clear though off-colour stone, may be employed.
3Meant to think bort... uncut, gem stones.
4The black diamonds, called bort, are used mainly for arming diamond drills and for polishing other diamonds.
5I vants zwei weeks' bort.
6You can go, and ven you brings de full moneys for zwei weeks' bort I gives you receipt for him.
7And John saw what Bort saw: ancient stone walls and smoke-discolored rafters.
8Bort and Poot turned from the terminal to regard her in surprise.
9Sheathing the new weapon, he turned in time to catch Bort's eye.
10Bort turned on his narrow bed and emitted a fat man's glottal snore.
11For a moment Bort and Garrypoot looked at one another.
12Bort and the gangboys evidently weren't the only ones who had had strange dreams.
13John opened his eyes at the glee in Bort's voice.
14Who can Bort hate for takin' his dream from him?
15But what kind of a religion is it, Bort?
16Bort and Garrypoot looked at one another disbelievingly, then at Clea, at Shamble, at John.