Brianite

From Wikipedia, the free encyclopedia
Jump to: navigation, search
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.

See also[edit]

References[edit]