Alum-(Na) Mineral Data

Alum-(Na) Mineral Data
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General Alum-(Na) Information

Help on Chemical Formula: Chemical Formula: NaAl(SO4)2•12(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: NaAl(SO4)2•12(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA)
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition.
Help on Synonym: Synonym: Sodium alum - Renamed to Alum-(Na) by Mineralogical Record, v39 (2008), p131
  Sodium-alum
 

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Alum-(Na) Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 12.214, Z = 4; V = 1,822.11 Den(Calc)= 1.67
Help on Crystal System: Crystal System: Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P a3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.314(1), 2.962(0.35), 3.526(0.14),
Click Here for Large Alum-(Na) Structure Window Crystal Structure:

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Cromer D T , Kay M I , Larson A C , Acta Crystallographica , 22 (1967) p.182-187, Refinement of the alum structures. II. X-ray and neutron diffraction of, NaAl(SO4)2*12H2O, gamma alum, Locality: synthetic

 

Physical Properties of Alum-(Na)

Help on Color: Color: Colorless.
Help on Density: Density: 1.67
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
 

Optical Properties of Alum-(Na)

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Isotropic, n=1.4388.
 

Calculated Properties of Alum-(Na)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.75 gm/cc
note: Specific Gravity of Alum-(Na) =1.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0013926207
Boson Index = 0.9986073793
Help on Photoelectric: Photoelectric: PEAlum-(Na) = 1.22 barns/electron
U=PEAlum-(Na) x rElectron Density= 2.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alum-(Na) is Not Radioactive
 

Alum-(Na) Classification
Help on Dana Class: Dana Class: 29.05.05.02 (29)Hydrated Acid and Sulfates
  (29.05)where A B (XO4)2 · 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
Help on Strunz Class: 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
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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:

 

Notes: