Natrobetpakdalite Mineral Data

General Natrobetpakdalite Information

Chemical Formula:

(Na,Ca)3Fe+++2(As2Mo6O28)•15(H2O)

Composition:

Molecular Weight = 1,641.45 gm

Sodium 2.80 % Na 3.78 % Na₂O

Calcium 2.44 % Ca 3.42 % CaO

Iron 6.80 % Fe 9.73 % Fe₂O₃

Molybdenum 35.07 % Mo 52.61 % MoO₃

Arsenic 9.13 % As 14.00 % As₂O₅

Hydrogen 1.84 % H 16.46 % H₂O

Oxygen 41.91 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂CaFe³⁺₂As₂Mo₆O₂₈•15(H₂O)

Environment:

In the zone of oxidation of a molybdenum deposit.

IMA Status:

Approved IMA 1971

Locality:

Kazakhstan (?) Link to MinDat.org Location Data.

Name Origin:

Named for the chemistry and similarity to betpakdalite.

Synonym:

Sodium betpakdalite - Renamed to Natrobetpakdalite by Mineralogical Record, v39 (2008), p131

Natrobetpakdalite Crystallography

Axial Ratios:

a:b:c =0.5844:1:0.9155

Cell Dimensions:

a = 11.28, b = 19.3, c = 17.67, Z = 4; beta = 94.5° V = 3,834.97 Den(Calc)= 2.84

Crystal System:

Monoclinic Space Group: Unk

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

By Intensity(I/I_o): 8.73(1), 3.63(0.9), 1.84(0.8),

Physical Properties of Natrobetpakdalite

Color:

Lemon yellow.

Density:

2.92

Habit:

Powdery - Forms a loose, poorly-coherent pulverulent mass.

Luster:

Earthy (Dull)

Optical Properties of Natrobetpakdalite

Gladstone-Dale:

CI meas= -0.105 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.136 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.282,KPDmeas= 0.2743,KC= 0.2483
Ncalc = 1.71 - 1.73

Optical Data:

Biaxial (?), a=1.792, g=1.81, bire=0.0180

Pleochroism (x):

pale yellow.

Pleochroism (z):

yellow.

Calculated Properties of Natrobetpakdalite

Electron Density:

Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Natrobetpakdalite =2.92 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_{Natrobetpakdalite}= 64.67 barns/electron
U=PE_{Natrobetpakdalite} x rElectron Density= 180.84 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natrobetpakdalite is Not Radioactive

Natrobetpakdalite Classification

Dana Class:

49.04.04.01 (49)Basic and Hydrated Molybdates and Tungstates

(49.04)(Compound Anions)

(49.04.04)Dana Group

49.04.04.01 Natrobetpakdalite (Na,Ca)3Fe2(As2Mo6O28)•15(H2O) Unk Mono

Strunz Class:

08.DM.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DM -With large and medium-sized cations, (OH, etc.):RO4 > 2:1

08.DM.15 Betpakdalite [Mg(H2O)6]Ca2(H2O)13[Mo8As2Fe3O36(OH)]•4(H2O) C 2/m 2/m

08.DM.15 Melkovite CaFeH6(MoO4)4(PO4)•6(H2O) Unk. Mono

08.DM.15 Natrobetpakdalite (Na,Ca)3Fe2(As2Mo6O28)•15(H2O) Unk Mono

Other Natrobetpakdalite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Natrobetpakdalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Natrobetpakdalite

(Na,Ca)3Fe+++2(As2Mo6O28)•15(H2O)
Dana No: 49.04.04.01 Strunz No: 08.DM.15
Locality:

Notes:

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