Types of artificial abrasives?

Types of artificial abrasives?
Artificial abrasives are divided into several categories such as corundum series, carbide series, and superhard series.
1. Corundum series artificial abrasives
(1) White corundum (WA)
(2) Brown corundum (A)
(3) Chrome corundum (PA)
(4) Microcrystalline corundum (MA)
(5) Single crystal corundum (SA)
(6)Zirconium corundum (ZA)
(7) Praseodymium and neodymium corundum (NA)
(8) Black corundum (BA)
2.Silicon carbide series
(1) Green silicon carbide (GC)
(2) Black silicon carbide (C)