Natroalunite Mineral Data

Natroalunite Mineral Data

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General Natroalunite Information

Chemical Formula:

NaAl3(SO4)2(OH)6

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

Empirical Formula:

NaAl₃(SO₄)₂(OH)₆

IMA Status:

Valid Species (Pre-IMA) 1911

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 31244

PDF 41-1467

Natroalunite Image

Images:

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

Axial Ratios:

a:c = 1:2.39931

Cell Dimensions:

a = 6.977, c = 16.74, Z = 3; V = 705.71 Den(Calc)= 2.81

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.96(1), 4.9(0.75), 2.97(0.7),

Forms:

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Forms: [ 0 1 2] [ 0 0 1]

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Physical Properties of Natroalunite

Cleavage:

[1110] Distinct

Color:

White, Grayish, Yellowish, Reddish, Brownish.

Density:

2.6 - 2.9, Average = 2.75

Diaphaniety:

Transparent to Subopaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Natroalunite

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

Optical Data:

Uniaxial (+), w=1.568, e=1.59, bire=0.0220.

Calculated Properties of Natroalunite

Electron Density:

r_electron=2.76 gm/cc
note: r_Natroalunite=2.75 gm/cc.

Fermion Index

Fermion Index = 0.00148
Boson Index = 0.99852

Photoelectric:

PE_Natroalunite= 1.69 barns/electron
U=PE_Natroalunite x r_electron= 4.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natroalunite is Not Radioactive

Natroalunite Classification

Dana Class:

30.2.4.2 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.2)where (A B)2 XO4 Zq

(30.2.4)Alunite Group (Alunite Subgroup)

30.2.4.1 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig

30.2.4.2 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m

30.2.4.3 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m

30.2.4.4 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m

30.2.4.5 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m

30.2.4.6 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m

30.2.4.7 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m

30.2.4.8 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m

Strunz Class:

VI/B.11-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. mostly big cations

VI/B.11 - Alunite group, Natroalunite - Jarosite - Beaverite

VI/B.11-10 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-20 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig

VI/B.11-30 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-40 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-43 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-45 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-50 Natrojarosite NaFe3(SO4)2(OH)6 R 3m 3m

VI/B.11-60 Jarosite KFe3(SO4)2(OH)6 R 3 3

VI/B.11-65 Dorallcharite (Tl,K)Fe3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-70 Ammoniojarosite (NH4)Fe3(SO4)2(OH)6 R 3m 3m

VI/B.11-80 Hydronium-jarosite (H3O)Fe3(SO4)2(OH)6 R 3m 3m

VI/B.11-90 Argentojarosite AgFe3(SO4)2(OH)6 R 3m 3m

VI/B.11-100 Plumbojarosite PbFe6(SO4)4(OH)12 R 3m 3 2/m

VI/B.11-110 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m

VI/B.11-120 Beaverite PbCu(Fe,Al)2(SO4)2(OH)6 R 3m 3m

Other Natroalunite 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 Natroalunite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 - Glendale Community College 6 -Google Images 7 -Google Scholar 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Print or Cut-and-Paste your Natroalunite Specimen Label here :

Natroalunite

NaAl3(SO4)2(OH)6
Dana No: 30.2.4.2 Strunz No: VI/B.11-10
Locality:

Notes: