Aristarainite Mineral Data

General Aristarainite Information

Chemical Formula:

Na2MgB12O20•8(H2O)

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

Empirical Formula:

Na₂MgB₁₂O₂₀•6(H₂O)

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_{Aristarainite}= 0.48 barns/electron
U=PE_{Aristarainite} x rElectron 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:

Notes:

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