Aristarainite Mineral Data
General Aristarainite Information
Chemical Formula:
Na2MgB12O20•8(H2O)
Composition:
Molecular Weight = 628.08 gm
Sodium 7.32 % Na 9.87 % Na2 O
Magnesium 3.87 % Mg 6.42 % MgO
Boron 20.65 % B 66.51 % B2 O3
Hydrogen 1.93 % H 17.21 % H2 O
Oxygen 66.23 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na2 MgB12 O20 •6(H2 O)
Environment:
Playa evaporite sequence.
IMA Status:
Approved IMA 1974
Locality:
Tincalayu borax deposit, Salar del Hombre Muerto, Salta Province, Argentina. Link to MinDat.org Location Data.
Name Origin:
Named for Lorenzo Francisco Aristarain (1926- ), Argentine mineralogist specializing in borate deposits, La Plata University, Buenos Aires, Argentina.
Name Pronunciation:
Aristarainite + Pronunciation
Synonym:
ICSD 10417
PDF 26-1379
Aristarainite Image
Images:
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
Axial Ratios:
a:b:c =2.5111:1:1.039
Cell Dimensions:
a = 18.886, b = 7.521, c = 7.815, Z = 2; beta = 97.72° V = 1,099.99 Den(Calc)= 1.90
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21 /a
X Ray Diffraction:
By Intensity(I/Io ): 7.74(1), 2.579(0.19), 3.037(0.13),
Physical Properties of Aristarainite
Cleavage:
{001} Perfect, {100} Perfect, {110} Good
Color:
Colorless.
Density:
2.027
Diaphaneity:
Transparent
Hardness:
3.5 - Copper Penny
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Aristarainite
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
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
Electron Density:
Bulk Density (Electron Density)=2.03 gm/cc note: Specific Gravity of Aristarainite =2.03 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PEAristarainite = 0.48 barns/electronU=PEAristarainite x r Electron Density= 0.98 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Aristarainite is Not Radioactive
Aristarainite Classification
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
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
References:
NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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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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:
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