Ammoniojarosite Mineral Data

Ammoniojarosite Mineral Data +

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General Ammoniojarosite Information

Chemical Formula:

(NH4)Fe+++3(SO4)2(OH)6

Composition:

Molecular Weight = 479.75 gm

Iron 34.92 % Fe 49.93 % Fe₂O₃

Hydrogen 0.84 % H - % Calc as (NH₄)₂O

Hydrogen 1.26 % H 11.27 % H₂O

Sulfur 13.37 % S 33.38 % SO₃

Nitrogen 2.92 % N 5.43 % (NH₄)₂O

Oxygen 46.69 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)Fe³⁺₃(SO₄)₂(OH)₆

IMA Status:

Valid Species (Pre-IMA) 1927

Locality:

Link to MinDat.org Location Data.

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Ammoniojarosite Crystallography

Axial Ratios:

a:c = 1:2.36111

Cell Dimensions:

a = 7.2, c = 17, Z = 3; V = 763.21 Den(Calc)= 3.13

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): 3.1(1), 5.1(0.6), 1.99(0.4),

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Physical Properties of Ammoniojarosite

Color:

Yellow.

Density:

3.02

Diaphaniety:

Transparent

Hardness:

3.5-4.5 - Between Copper Penny and Fluorite-Apatite

Luminescence:

Non-fluorescent.

Luster:

Earthy (Dull)

Streak:

light yellow

Optical Properties of Ammoniojarosite

Gladstone-Dale:

CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2476,KPDmeas= 0.2566,KC= 0.2547

Optical Data:

Uniaxial (-), e=1.75, w=1.8, bire=0.0500.

Calculated Properties of Ammoniojarosite

Electron Density:

r_electron=3.01 gm/cc
note: r_{Ammoniojarosite}=3.02 gm/cc.

Fermion Index

Fermion Index = 0.03772
Boson Index = 0.96228

Photoelectric:

PE_{Ammoniojarosite}= 11.07 barns/electron
U=PE_{Ammoniojarosite} x r_electron= 33.31 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ammoniojarosite is Not Radioactive

Ammoniojarosite Classification

Dana Class:

30.2.5.4 (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.11-70 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 Ammoniojarosite 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 Ammoniojarosite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Ammoniojarosite

(NH4)Fe+++3(SO4)2(OH)6
Dana No: 30.2.5.4 Strunz No: VI/B.11-70
Locality:

Notes: