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 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
 
 
 
 
 
 
 
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/m3) 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 WindowCrystal 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 Electron Density= 2.14 barns/cc.
Help on Radioactivity:Radioactivity:GRapi = 0(Gamma Ray American Petroleum Institute Units)
Alum-(Na) isNot 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
 
 
 
 
 
Help on Strunz Class:Strunz Class: 07.CC.2007 - SULFATES (SELENATES, TELLURATES)
 07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
 07.CC -With medium-sized and large cations
 
 
 
 
 
 

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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