Mineralogy Database

Brianite Mineral Data

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General Brianite Information

Help on Chemical  Formula: Chemical Formula: Na2CaMg(PO4)2
Help on Composition: Composition: Molecular Weight = 300.31 gm
   Sodium      15.31 %  Na   20.64 % Na2O
   Calcium     13.35 %  Ca   18.67 % CaO
   Magnesium    8.09 %  Mg   13.42 % MgO
   Phosphorus  20.63 %  P    47.27 % P2O5
   Oxygen      42.62 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2CaMg(PO4)2
Help on Environment: Environment: A very rare component in phosphate modules in an iron meteorite.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: In the Dayton finest (very fine-grained) octahedrite meteorite. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: In honor of Dr. Brian Harold Mason (1917- ), U.S. National Museum, Washington, D.C., USA, for his contributions to the study of meteorites.
Help on Name Pronunciation: Name Pronunciation: Brianite Say BRIANITE
Help on Synonym: Synonym: ICSD 408373
  PDF 29-1192

Brianite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.5544:1:1.7456
Help on Cell Dimensions: Cell Dimensions: a = 13.36, b = 5.23, c = 9.13, Z = 4; beta = 91.2° V = 637.80 Den(Calc)= 3.13
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.625(1), 2.679(0.9), 3.734(0.9),

Physical Properties of Brianite

Help on Color: Color: Colorless.
Help on Density: Density: 3
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Brianite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.049 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1929,KPDmeas= 0.2012,KC= 0.1918
Ncalc = 1.58 - 1.6
Help on Optical Data: Optical Data: Biaxial (-), a=1.598, b=1.605, g=1.608, bire=0.0100, 2V(Calc)=66, 2V(Meas)=63-65.

Calculated Properties of Brianite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Brianite =3.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0084781832
Boson Index = 0.9915218168
Help on Photoelectric: Photoelectric: PEBrianite = 3.06 barns/electron
U=PEBrianite x rElectron Density= 9.43 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brianite is Not Radioactive

Brianite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.01)A+ B++ XO4
  (38.01.07)Dana Group Brianite Na2CaMg(PO4)2 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 08.AC.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
08.AC.30 Brianite Na2CaMg(PO4)2 P 21/a 2/m

Other Brianite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Brianite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.AC.30





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