Appearance: Grey powder ; Silvery-white metallic solid in various forms
Products:
MgO – Magnesium oxide
Other names: Magnesia, Periclase, Magnesium oxide fume
Appearance: White powder ; Hygroscopic fine white powder ; Finely divided white particulate dispersed in air. [Note: Exposure may occur when magnesium is burned, thermally cut, or welded upon.]
Si
Names: Silicon, Si, Element 14
Appearance: Steel-grey crystals or black-to-brown amorphous powder ; Black to gray, lustrous, needle-like crystals. [Note: The amorphous form is a dark-brown powder.]