Sapphire powder is an inorganic chemical compound, the powder obtained from a ground native gem consisting chiefly of aluminum oxide.

Chemical name 2,4,5-trioxa-1,3-dialuminabicyclo[1.1.1]pentane

Molecular Formula Al2O3

Safety
Aluminium can interfere with different biological processes (cellular oxidative stress, calcium metabolism, etc.), so it can induce toxic effects in different organs and systems, and the nervous system is the main target of its toxicity.

What it is used for and where
Cosmetics
Opacifying agent. It is useful into formulations that may be translucent or transparent to make them opaque and less permeable to light.
Synonyms:

CAS: 1317-82-4