Brianite
(repeating unit)Na2CaMg(PO4)2 IMA symbol Bne[1] Strunz classification 8.AC.30 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group P21/a Unit cell a = 13.36 Å, b = 5.23 Å,
c = 9.13 Å, β = 91.2°; Z = 4 Identification Color Colorless Crystal habit Anhedral grains with lamellar structure visible under polarized light Twinning Polysynthetic on {100} Mohs scale hardness 4-5 Luster Vitreous 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° Extinction 2 to 3° from lamellae References [2][3][4][5] Meteorite... Classification
Mineralogy
and petrology Lists
(same H-M symbol)
c = 9.13 Å, β = 91.2°; Z = 4
Brianite is a phosphate mineral with the chemical formula Na2CaMg(PO4)2.[4] It was first identified in an iron meteorite.[3] This mineral is named after Brian Harold Mason (1917–2009), a pioneer in meteoritics.[3]
It was first reported from the Dayton meteorite in Montgomery County, Ohio in 1966.[3] It occurs in phosphate nodules within the meteorite. Associated minerals include: panethite, whitlockite, albite, enstatite, schreibersite, kamacite, taenite, graphite, sphalerite and troilite.[5]
See also
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Mineralienatlas
- ^ a b c d Brianite mineral information and data on Mindat
- ^ a b Brianite data on Webmin
- ^ a b "Brianite data from the Handbook of Mineralogy" (PDF). Archived from the original (PDF) on 2015-09-24. Retrieved 2015-01-31.
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