Sodium-alum Mineral Data

Sodium-alum Mineral Data

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General Sodium-alum Information

Chemical Formula:

NaAl(SO4)2·12(H2O)

Composition:

Molecular Weight = 458.28 gm

Sodium 5.02 % Na 6.76 % Na₂O

Aluminum 5.89 % Al 11.12 % Al₂O₃

Hydrogen 5.28 % H 47.17 % H₂O

Sulfur 13.99 % S 34.94 % SO₃

Oxygen 69.82 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaAl(SO₄)₂·12(H₂O)

IMA Status:

Valid Species (Pre-IMA)

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 15368

PDF 29-1167

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Sodium-alum Crystallography

Cell Dimensions:

a = 12.214, Z = 4; V = 1,822.11 Den(Calc)= 1.67

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P a3

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

By Intensity(I/I_o): 4.314(1), 2.962(0.35), 3.526(0.14),

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Physical Properties of Sodium-alum

Color:

Colorless.

Density:

1.73

Diaphaniety:

Transparent

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Optical Properties of Sodium-alum

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2661,KPDmeas= 0.2569,KC= 0.2581

Optical Data:

Isotropic, n=1.4388.

Calculated Properties of Sodium-alum

Electron Density:

r_electron=1.81 gm/cc
note: r_Sodium-alum=1.73 gm/cc.

Fermion Index

Fermion Index = 0.00139
Boson Index = 0.99861

Photoelectric:

PE_Sodium-alum= 1.22 barns/electron
U=PE_Sodium-alum x r_electron= 2.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sodium-alum is Not Radioactive

Sodium-alum Classification

Dana Class:

29.5.5.2 (29)Hydrated Acid and Sulfates

(29.5)where A B (XO4)2 · x(H2O)

(29.5.5)Alum Group

29.5.5.1 Potassium-alum KAl(SO4)2·12(H2O) P a3 2/m 3

29.5.5.2 Sodium-alum NaAl(SO4)2·12(H2O) P a3 2/m 3

29.5.5.3 Tschermigite (NH4)Al(SO4)2·12(H2O) P a3 2/m 3

29.5.5.4 Lonecreekite (NH4)(Fe,Al)(SO4)2·12(H2O) P a3 2/m 3

29.5.5.5 Lanmuchangite! TlAl(SO4)2·12(H2O) P a3 2/m 3

Strunz Class:

VI/C.14-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size

VI/C.14 - Sodium alum - Zincovoltaite series

VI/C.14-10 Sodium-alum NaAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-20 Potassium-alum KAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-30 Tschermigite (NH4)Al(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-40 Lonecreekite (NH4)(Fe,Al)(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-45 Lanmuchangite! TlAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-50 Voltaite K2Fe5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

VI/C.14-60 Zincovoltaite K2Zn5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

Other Sodium-alum 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 Sodium-alum :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Sodium-alum

NaAl(SO4)2·12(H2O)
Dana No: 29.5.5.2 Strunz No: VI/C.14-10
Locality:

Notes: