Calciborite

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Calciborite
General
Category Inoborates
Formula
(repeating unit)
CaB2O4
Strunz classification 06.BC.10
Unit cell a = 8.38 Å, b = 13.82 Å, c = 5.00 Å; Z = 8
Identification
Formula mass 125.70 g
Color White
Crystal system Orthorhombic
Cleavage none
Fracture Conchoidal
Mohs scale hardness 3.5
Luster Vitreous
Streak white
Diaphaneity translucent
Density 2.878 g/cm3
Optical properties Biaxial (-)
Refractive index nα = 1.595 nβ = 1.654 nγ = 1.670
Birefringence δ = 0.075
2V angle Measured: 54°
References [1][2][3]

Calciborite (Ca[B2O4]) is a mineral discovered in 1955 in Russia.[4]

It was first described in 1955 in the Novofrolovskoye copper deposit, near Krasnoturinsk, Turinsk district, Northern Ural Mountains, Russia.[2] It occurs in a skarn deposit formed in limestone adjacent to a quartz diorite intrusive. It occurs associated with: sibirskite, calcite, dolomite, garnet, magnetite and pyroxene.[3]

References[edit]