What is "calciborite"

n. (context mineral English) An orthorhombic-dipyramidal white mineral containing boron, calcium, and oxygen.

Calciborite, CaBO, is a rare calcium borate mineral.

It was first described in 1955 in the Novofrolovskoye copper–boron deposit, near Krasnoturinsk, Turinsk district, Northern Ural Mountains, Russia. It occurs in a skarn deposit formed in limestone adjacent to a quartz diorite intrusive. It occurs associated with: sibirskite (another rare calcium borate mineral), calcite, dolomite, garnet, magnetite and pyroxene. It has also been reported from the Fuka mine of Okayama Prefecture, Japan.