[geraldhh]

idk

"In the Earth's crust, aluminium is the most abundant metallic element (8.23% by mass)"

https://en.wikipedia.org/wiki/Aluminium#Earth

[ClumsyPilot]

Alumium oxide only. It does not exist in pure form.

[geraldhh]

quote from the article:

"The powder consists of nano-size flakes of aluminum oxide, molybdenum sulfide, copper, and iron oxide."