| Calciborite | |
|---|---|
| General | |
| Category | Inoborates |
| Chemical formula | CaB2O4 |
| Strunz classification | 06.BC.10 |
| Unit cell | a = 8.38 Å, b = 13.82 Å, c = 5.00 Å; Z = 8 |
| Identification | |
| Molar 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]