Natrojarosite Mineral Data

Natrojarosite Mineral Data +

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General Natrojarosite Information

Chemical Formula:

NaFe+++3(SO4)2(OH)6

Composition:

Molecular Weight = 484.70 gm

Sodium 4.74 % Na 6.39 % Na₂O

Iron 34.57 % Fe 49.42 % Fe₂O₃

Hydrogen 1.25 % H 11.15 % H₂O

Sulfur 13.23 % S 33.04 % SO₃

Oxygen 46.21 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaFe³⁺₃(SO₄)₂(OH)₆

IMA Status:

Valid Species (Pre-IMA) 1902

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition and similarity to Jarosite.

Natrojarosite Image

Images:

Natrojarosite

Comments: Yellow brown natrojarosite crystals.
Location: Kamareza Mine, Laurium, Attiki, Greece. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natrojarosite Crystallography

Axial Ratios:

a:c = 1:2.27019

Cell Dimensions:

a = 7.18, c = 16.3, Z = 3; V = 727.72 Den(Calc)= 3.32

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 5.06(1), 3.06(0.8), 3.12(0.7),

Forms:

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

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Physical Properties of Natrojarosite

Cleavage:

[0001] Perfect

Color:

Yellow, Ochre yellow, Ochre brown.

Density:

2.9 - 3.3, Average = 3.09

Diaphaniety:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2.5-3.5 - Finger Nail-Copper Penny

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Natrojarosite

Dichroism (e):

colorless, very pale yellow, or pale greenish yellow.

Dichroism (w):

colorless, deep golden yellow, or deep golden yellow.

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.099 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.238,KPDmeas= 0.2548,KC= 0.2642

Optical Data:

Uniaxial (-), e=1.75, w=1.83, bire=0.0800.

Calculated Properties of Natrojarosite

Electron Density:

r_electron=3.06 gm/cc
note: r_{Natrojarosite}=3.10 gm/cc.

Fermion Index

Fermion Index = 0.00854
Boson Index = 0.99146

Photoelectric:

PE_{Natrojarosite}= 11.13 barns/electron
U=PE_{Natrojarosite} x r_electron= 34.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natrojarosite is Not Radioactive

Natrojarosite Classification

Dana Class:

30.2.5.2 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.2)where (A B)2 XO4 Zq

(30.2.5)Alunite Group (Jarosite Subgroup)

30.2.5.1 Jarosite KFe3(SO4)2(OH)6 R 3 3

30.2.5.2 Natrojarosite NaFe3(SO4)2(OH)6 R 3m 3m

30.2.5.3 Hydronium-jarosite (H3O)Fe3(SO4)2(OH)6 R 3m 3m

30.2.5.4 Ammoniojarosite (NH4)Fe3(SO4)2(OH)6 R 3m 3m

30.2.5.5 Argentojarosite AgFe3(SO4)2(OH)6 R 3m 3m

30.2.5.6 Plumbojarosite PbFe6(SO4)4(OH)12 R 3m 3 2/m

30.2.5.7 Beaverite PbCu(Fe,Al)2(SO4)2(OH)6 R 3m 3m

30.2.5.8 Dorallcharite (Tl,K)Fe3(SO4)2(OH)6 R 3m 3 2/m

Strunz Class:

VI/B.11-50 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 Natrojarosite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Natrojarosite

NaFe+++3(SO4)2(OH)6
Dana No: 30.2.5.2 Strunz No: VI/B.11-50
Locality:

Notes: