Aristarainite Mineral Data

Aristarainite Mineral Data +

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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)

IMA Status:

Approved IMA 1974

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 10417

PDF 26-1379

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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 - PrismaticH-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),

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

Cleavage:

[001] Perfect, [100] Perfect, [110] Good

Color:

Colorless.

Density:

2.027

Diaphaniety:

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

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:

r_electron=2.03 gm/cc
note: r_{Aristarainite}=2.03 gm/cc.

Fermion Index

Fermion Index = 0.04529
Boson Index = 0.95471

Photoelectric:

PE_{Aristarainite}= 0.48 barns/electron
U=PE_{Aristarainite} x r_electron= 0.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aristarainite is Not Radioactive

Aristarainite Classification

Dana Class:

26.6.5.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.6)Dana Type

(26.6.5)Dana Group

26.6.5.1 Aristarainite Na2MgB12O20·8(H2O) P 2₁/a 2/m

Strunz Class:

V/J.06-10 V - Nitrates, Carbonates and Borates

V/J - Chain borates with [B2O4]2- to [B6O10]2-

V/J.06 - Aristarainite series

V/J.06-10 Aristarainite Na2MgB12O20·8(H2O) P 2₁/a 2/m

Other Aristarainite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Aristarainite

Na2MgB12O20·8(H2O)
Dana No: 26.6.5.1 Strunz No: V/J.06-10
Locality:

Notes: