Chemistry:Brianite
From HandWiki
| Brianite | |
|---|---|
 Small white microcrystals of brianite from the Dayton meteorite | |
| General | |
| Category | Phosphate minerals |
| Formula (repeating unit) | Na2CaMg(PO4)2 |
| 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 structur visible under polarized light |
| Twinning | Polysynthetic on {100} |
| Mohs scale hardness | 4-5 |
| |re|er}} | 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 | [1][2][3][4] |
Brianite is a phosphate mineral with the chemical formula Na2CaMg(PO4)2.[3] It was first identified in an iron meteorite.[2] This mineral is named after Brian Harold Mason (1917–2009), a pioneer in meteoritics.[2]
It was first reported from the Dayton meteorite in Montgomery County, Ohio in 1966.[2] It occurs in phosphate nodules within the meteorite. Associated minerals include: panethite, whitlockite, albite, enstatite, schreibersite, kamacite, taenite, graphite, sphalerite and troilite.[4]
See also
References
- ↑ Mineralienatlas
- ↑ 2.0 2.1 2.2 2.3 Brianite mineral information and data on Mindat
- ↑ 3.0 3.1 Brianite data on Webmin
- ↑ 4.0 4.1 "Brianite data from the Handbook of Mineralogy". http://www.handbookofmineralogy.com/pdfs/brianite.pdf.
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
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