Low density, low strength metal commonly used as an additive in chemical compounds, namely borosilicate glass and ceramics.
Boron is a primary constituent of borax and sassolite (borate minerals), the former of which is commonly used as a glaze in pottery and ceramics, the latter of which is mineralized boric acid, a useful antiseptic, insecticide, flame retardant, and precursor chemical.
Sodium perborate is useful as a laundry detergent and bleach.