Aristarainite Mineral Data

Aristarainite Mineral Data
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General Aristarainite Information

Help on Chemical Formula: Chemical Formula: Na2MgB12O20•8(H2O)
Help on Composition: Composition: Molecular Weight = 628.08 gm
   Sodium      7.32 %  Na    9.87 % Na2O
   Magnesium   3.87 %  Mg    6.42 % MgO
   Boron      20.65 %  B    66.51 % B2O3
   Hydrogen    1.93 %  H    17.21 % H2O
   Oxygen     66.23 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2MgB12O20•6(H2O)
Help on Environment: Environment: Playa evaporite sequence.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: Tincalayu borax deposit, Salar del Hombre Muerto, Salta Province, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lorenzo Francisco Aristarain (1926- ), Argentine mineralogist specializing in borate deposits, La Plata University, Buenos Aires, Argentina.
Help on Name Pronunciation: Name Pronunciation: Aristarainite + Pronunciation Say ARISTARAINITE
Help on Synonym: Synonym: ICSD 10417
  PDF 26-1379
 

Aristarainite Image

Click Here for Larger Aristarainite Image in a New Browser Window Images:
Click Here for Larger Aristarainite Image

Aristarainite

Comments: B&W image of aristarainite crystals freed from the enclosing borax/kernite (AmMin, v59:647).
Location: Tincalayu mine, Salta, Argentina. Scale: See Image.
© American Mineralogist

Aristarainite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =2.5111:1:1.039
Help on Cell Dimensions: Cell Dimensions: a = 18.886, b = 7.521, c = 7.815, Z = 2; beta = 97.72° V = 1,099.99 Den(Calc)= 1.90
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.74(1), 2.579(0.19), 3.037(0.13),
Click Here for Large Aristarainite Structure Window Crystal Structure:

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Ghose S , Wan C , American Mineralogist , 62 (1977) p.979-989, Aristarainite: Na2Mg[B6O8(OH)4]2.4H2O: a sheet structure with chains of, hexaborate polyanions

 

Physical Properties of Aristarainite

Help on Cleavage: Cleavage: {001} Perfect, {100} Perfect, {110} Good
Help on Color: Color: Colorless.
Help on Density: Density: 2.027
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Aristarainite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.133 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.264,KPDmeas= 0.2475,KC= 0.2331
Ncalc = 1.44 - 1.47
Help on Optical Data: Optical Data: Biaxial (+), a=1.484, b=1.498, g=1.523, bire=0.0390, 2V(Calc)=76, 2V(Meas)=70.
 

Calculated Properties of Aristarainite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.03 gm/cc
note: Specific Gravity of Aristarainite =2.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEAristarainite = 0.48 barns/electron
U=PEAristarainite x rElectron Density= 0.98 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aristarainite is Not Radioactive
 

Aristarainite Classification
Help on Dana Class: Dana Class: 26.06.05.01 (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.06)Dana Type
  (26.06.05)Dana Group
 
26.06.05.01 Aristarainite Na2MgB12O20•8(H2O) P 21/a 2/m
Help on Strunz Class: Strunz Class: 06.FB.05 06 - BORATES
  06.F - Hexaborates
  06.FB -Ino-hexaborates
 
06.FB.05 Aristarainite Na2MgB12O20•8(H2O) P 21/a 2/m
 

Other Aristarainite Information
Help on References: References: NAME( AntBidBlaNic5) 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 Aristarainite :
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
15 - WWW-MINCRYST

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Ask about Aristarainite here :
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Print or Cut-and-Paste your Aristarainite Specimen Label here :

Aristarainite

Na2MgB12O20•8(H2O)
Dana No: 26.06.05.01 Strunz No: 06.FB.05
Locality:

 

Notes: