Alum-(Na) Mineral Data

General Alum-(Na) 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.

Name Origin:

Named for the composition.

Synonym:

Sodium alum - Renamed to Alum-(Na) by Mineralogical Record, v39 (2008), p131

Sodium-alum

Alum-(Na) Crystallography

Cell Dimensions:

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

Crystal System:

Isometric - Diploidal H-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),

Physical Properties of Alum-(Na)

Color:

Colorless.

Density:

1.67

Diaphaneity:

Transparent

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Optical Properties of Alum-(Na)

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2628,KPDmeas= 0.2628,KC= 0.2581
Ncalc = 1.43

Optical Data:

Isotropic, n=1.4388.

Calculated Properties of Alum-(Na)

Electron Density:

Bulk Density (Electron Density)=1.75 gm/cc
note: Specific Gravity of Alum-(Na) =1.67 gm/cc.

Fermion Index:

Fermion Index = 0.0013926207
Boson Index = 0.9986073793

Photoelectric:

PE_Alum-(Na)= 1.22 barns/electron
U=PE_Alum-(Na) x rElectron Density= 2.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alum-(Na) is Not Radioactive

Alum-(Na) Classification

Dana Class:

29.05.05.02 (29)Hydrated Acid and Sulfates

(29.05)where A B (XO4)2 ï¿½ x(H2O)

(29.05.05)Alum Group

29.05.05.01 Alum-(K) KAl(SO4)2•12(H2O) P a3 2/m 3

29.05.05.02 Alum-(Na) NaAl(SO4)2•12(H2O) P a3 2/m 3

29.05.05.03 Tschermigite (NH4)Al(SO4)2•12(H2O) P a3 2/m 3

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

29.05.05.05 Lanmuchangite! TlAl(SO4)2•12(H2O) P a3 2/m 3

Strunz Class:

07.CC.20 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CC -With medium-sized and large cations

07.CC.20 Lonecreekite (NH4)(Fe,Al)(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Alum-(K) KAl(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Alum-(Na) NaAl(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Lanmuchangite! TlAl(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Tschermigite (NH4)Al(SO4)2•12(H2O) P a3 2/m 3

Other Alum-(Na) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Alum-(Na) :
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 Alum-(Na) Specimen Label here :

Alum-(Na)

NaAl(SO4)2•12(H2O)
Dana No: 29.05.05.02 Strunz No: 07.CC.20
Locality:

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