Aksaite Mineral Data

Aksaite Mineral Data +

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General Aksaite Information

Chemical Formula:

MgB6O7(OH)6·2(H2O)

Composition:

Molecular Weight = 339.24 gm

Magnesium 7.16 % Mg 11.88 % MgO

Boron 19.12 % B 61.57 % B₂O₃

Hydrogen 2.97 % H 26.55 % H₂O

Oxygen 70.74 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg(B₆O₇)(OH)₆·2(H₂O)

IMA Status:

Approved IMA 1962

Locality:

Kazakhstan, Chelkar, Ak-Sai Link to MinDat.org Location Data.

Synonym:

ICSD 15212

PDF 15-654

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Aksaite Crystallography

Axial Ratios:

a:b:c =0.5149:1:0.3073

Cell Dimensions:

a = 12.54, b = 24.35, c = 7.484, Z = 8; V = 2,285.23 Den(Calc)= 1.97

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bca

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

By Intensity(I/I_o): 6.4(1), 4.72(0.5), 6.1(0.5),

Crystal Structure:

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Dal Negro A , Ungaretti L , Sabelli C , American Mineralogist , 56 (1971) p.1553-1566, The crystal structure of aksaite

Physical Properties of Aksaite

Cleavage:

[???] Good

Color:

Colorless, Gray, Light gray.

Density:

1.99

Diaphaniety:

Transparent

Hardness:

2.5 - Finger Nail

Streak:

white

Optical Properties of Aksaite

Gladstone-Dale:

CI meas= -0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.254,KPDmeas= 0.2514,KC= 0.2464

Optical Data:

Biaxial (-), a=1.472, b=1.503, g=1.526, bire=0.0540, 2V(Calc)=78, 2V(Meas)=80.

Calculated Properties of Aksaite

Electron Density:

r_electron=2.02 gm/cc
note: r_Aksaite=1.99 gm/cc.

Fermion Index

Fermion Index = 0.04555
Boson Index = 0.95445

Photoelectric:

PE_Aksaite= 0.46 barns/electron
U=PE_Aksaite x r_electron= 0.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aksaite is Not Radioactive

Aksaite Classification

Dana Class:

26.6.4.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.6)Dana Type

(26.6.4)Dana Group

26.6.4.1 Aksaite MgB6O7(OH)6·2(H2O) P bca 2/m 2/m 2/m

Strunz Class:

V/H.17-30 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.17 - Admontite - Rivadavite series

V/H.17-10 Admontite MgB6O10·7(H2O) P 2₁/c 2/m

V/H.17-20 Mcallisterite Mg2B12O14(OH)12·9(H2O) R 3c 3 2/m

V/H.17-30 Aksaite MgB6O7(OH)6·2(H2O) P bca 2/m 2/m 2/m

V/H.17-40 Rivadavite Na6MgB24O40·22(H2O) P 2₁/c 2/m

Other Aksaite 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 Aksaite :
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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Aksaite

MgB6O7(OH)6·2(H2O)
Dana No: 26.6.4.1 Strunz No: V/H.17-30
Locality:

Notes: