What material is white aluminum oxide?

What material is white aluminum oxide?
white aluminum oxide, as the name suggests, is white.
Many people think that white aluminum oxide is a kind of white stone. In fact, it is not that white aluminum oxide is made of alumina powder as raw material, which is smelted at high temperature for a long time in a dumping furnace or a fixed furnace.
Since the raw material of white aluminum oxide is alumina, white aluminum oxide is made of alumina, AL2O3
The code name of white aluminum oxide is WA