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Natroalunite Mineral Data

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General Natroalunite Information

Help on Chemical  Formula: Chemical Formula: NaAl3(SO4)2(OH)6
Help on Composition: Composition: Molecular Weight = 398.11 gm
   Sodium     5.77 %  Na    7.78 % Na2O
   Aluminum  20.33 %  Al   38.42 % Al2O3
   Hydrogen   1.52 %  H    13.58 % H2O
   Sulfur    16.11 %  S    40.22 % SO3
   Oxygen    56.26 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaAl3(SO4)2(OH)6
Help on Environment: Environment: Formed by solfataric or hydrothermal sulfate-bearing solutions reacting with clays.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1911
Help on Locality: Locality: National Belle mine, Colorado, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the sodium, natrium, analog of alunite.
Help on Synonym: Synonym: ICSD 31244
  Natro-alunite - Renamed Natroalunite by Mineralogical Record, v39 (2008), p131
  PDF 41-1467
 

Natroalunite Image

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  Natroalunite

Comments: Pure white porcelaneous massive natroalunite.
Location: Sugarloaf Butte, Quartzite, La Paz County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natroalunite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.39931
Help on Cell Dimensions: Cell Dimensions: a = 6.977, c = 16.74, Z = 3; V = 705.71 Den(Calc)= 2.81
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.96(1), 4.9(0.75), 2.97(0.7),
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Forms: ( 0 1 2) ( 0 0 1)

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Physical Properties of Natroalunite

Help on Cleavage: Cleavage: {1110} Distinct
Help on Color: Color: White, Grayish, Yellowish, Reddish, Brownish.
Help on Density: Density: 2.6 - 2.9, Average = 2.75
Help on Diaphaneity: Diaphaneity: Transparent to Subopaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Natroalunite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.206,KPDmeas= 0.2105,KC= 0.2117
Ncalc = 1.55 - 1.61
Help on Optical Data: Optical Data: Uniaxial (+), w=1.568, e=1.59, bire=0.0220.
 

Calculated Properties of Natroalunite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.76 gm/cc
note: Specific Gravity of Natroalunite =2.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014805445
Boson Index = 0.9985194555
Help on Photoelectric: Photoelectric: PENatroalunite = 1.69 barns/electron
U=PENatroalunite x rElectron Density= 4.67 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natroalunite is Not Radioactive
 

Natroalunite Classification

Help on  Dana Class: Dana Class: 30.02.04.02 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen
  (30.02)where (A B)2 XO4 Zq
  (30.02.04)Alunite Group (Alunite Subgroup)
 
30.02.04.01 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig
 
30.02.04.02 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m
 
30.02.04.03 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m
 
30.02.04.04 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m
 
30.02.04.05 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m
 
30.02.04.06 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m
 
30.02.04.07 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m
 
30.02.04.08 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m
Help on  Strunz Class: Strunz Class: 07.BC.10 07 - SULFATES (SELENATES, TELLURATES)
  07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O
  07.BC -With medium-sized and large cations
 
07.BC.10 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig
 
07.BC.10 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m
 
07.BC.10 Ammoniojarosite (NH4)Fe3(SO4)2(OH)6 R 3m 3m
 
07.BC.10 Beaverite PbCu(Fe,Al)2(SO4)2(OH)6 R 3m 3m
 
07.BC.10 Argentojarosite AgFe3(SO4)2(OH)6 R 3m 3m
 
07.BC.10 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m
 
07.BC.10 Dorallcharite (Tl,K)Fe3(SO4)2(OH)6 R 3m 3 2/m
 
07.BC.10 Jarosite KFe3(SO4)2(OH)6 R 3 3
 
07.BC.10 Hydroniumjarosite (H3O)Fe3(SO4)2(OH)6 R 3m 3m
 
07.BC.10 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m
 
07.BC.10 Natrojarosite NaFe3(SO4)2(OH)6 R 3m 3m
 
07.BC.10 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m
 
07.BC.10 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m
 
07.BC.10 Plumbojarosite PbFe6(SO4)4(OH)12 R 3m 3 2/m
 
07.BC.10 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m
 
07.BC.10 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m
 

Other Natroalunite Information

Help on References: References: NAME( AntBidBlaNic5) 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 Natroalunite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Glendale Community College
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Natroalunite

NaAl3(SO4)2(OH)6
Dana No: 30.02.04.02 Strunz No: 07.BC.10
Locality:

 

Notes:

 

 
   
 


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