Brianite
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| Brianite | |
|---|---|
| General | |
| Category | Phosphate minerals |
| Formula (repeating unit) |
Na2CaMg(PO4)2 |
| Strunz classification | 08.AC.30 |
| Crystal symmetry | Monoclinic |
| Unit cell | a = 13.36 Å, b = 5.23 Å, c = 9.13 Å, β = 91.2° |
| Identification | |
| Color | colorless |
| Crystal system | 2/m - Prismatic |
| Mohs scale hardness | 4-5 |
| Diaphaneity | transparent |
| Specific gravity | 3.0-3.1 |
| Optical properties | biaxial (-) |
| Refractive index | nα = 1.598, nβ = 1.605, nγ = 1.608 |
| Birefringence | 0.010 |
| 2V angle | 63° to 65° |
Brianite is a phosphate mineral with the chemical formula Na2CaMg(PO4)2.[1] It was first identified in an iron meteorite.[2] This mineral is named after Brian Harold Mason (1917–2009), a pioneer in meteoritics.
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