Painite is a very rare borate mineral.

Boron most often occurs in nature as borates, such as borate minerals and borosilicates.

It occurs principally as an alteration product of inyoite, another borate mineral.

The borate minerals are minerals which contain a borate anion group.

There are over 100 different borate minerals.

Boron is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals.

More than one hundred borate minerals contain boron in oxidation state +3.

Ulexite is one of over a hundred borate minerals; it is a fibrous crystal where individual fibers can guide light like optical fibers.

Fabianite is a borate mineral with the chemical formula CaBO(OH).

Sassolite is a borate mineral, and is the mineral form of boric acid.