Jarosite Mineral Data

Jarosite Mineral Data +

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General Jarosite Information

Chemical Formula:

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

Composition:

Molecular Weight = 500.81 gm

Potassium 7.81 % K 9.40 % K₂O

Iron 33.45 % Fe 47.83 % Fe₂O₃

Hydrogen 1.21 % H 10.79 % H₂O

Sulfur 12.81 % S 31.97 % SO₃

Oxygen 44.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KFe³⁺₃(SO₄)₂(OH)₆

Environment:

Secondary mineral, forming under conditions of weathering in arid climates.

IMA Status:

Valid Species (Pre-IMA) 1852

Locality:

Barranco Jaroso in southern Spain. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 12107

PDF 36-427

Utahite

Jarosite Image

Images:

Jarosite Alunogen

Comments: Colorless to white, tabular crystals alunogen on reddish jarosite.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Jarosite Fairbankite

Comments: Colorless to white crystals of fairbankite with orangish brown jarosite.
Location: Tombstone, Tombstone District, Cochise Co., Arizona, USA. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Jarosite

Comments: Deep brown lustrous crystals of Jarosite to 2 mm.
Location: Soureza, Attika, Greece. Scale: 2.8 x 1.6 cm.
© John Veevaert

Images:

Jarosite Winstanleyite

Comments: Small, yellow octahedral crystal of winstanleyite on brownish red jarosite.
Location: Tombstone, Tombstone District, Cochise Co., Arizona, USA. Scale: Picture size 0.9 mm.
© Thomas Witzke / Abraxas-Verlag

Jarosite Crystallography

Axial Ratios:

a:c = 1:2.36199

Cell Dimensions:

a = 7.21, c = 17.03, Z = 3; V = 766.68 Den(Calc)= 3.25

Crystal System:

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

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

By Intensity(I/I_o): 3.08(1), 3.11(0.6), 2.292(0.5),

Forms:

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Crystal Structure:

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Becker U , Gasharova B , Physics and Chemistry of Minerals , 28 (2001) p.545-556, AFM observations and simulations of jarosite growth at the molecular scale:, probing the basis for the incorporation of foreign ions into jarosite, as a storage mineral

Physical Properties of Jarosite

Cleavage:

[0001] Distinct

Color:

Brown, Yellow, Yellow brown, Light yellow.

Density:

2.9 - 3.3, Average = 3.09

Diaphaniety:

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:

yellow

Optical Properties of Jarosite

Dichroism (e):

colorless, very pale yellow, or pale greenish yellow.

Dichroism (w):

colorless, deep golden yellow, or deep golden yellow.

Gladstone-Dale:

CI meas= 0.059 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.102 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2356,KPDmeas= 0.247,KC= 0.2624

Optical Data:

Uniaxial (-), e=1.713-1.715, w=1.815-1.82, bire=0.1020-0.1050.

Calculated Properties of Jarosite

Electron Density:

r_electron=3.06 gm/cc
note: r_Jarosite=3.10 gm/cc.

Fermion Index

Fermion Index = 0.00827
Boson Index = 0.99173

Photoelectric:

PE_Jarosite= 11.47 barns/electron
U=PE_Jarosite x r_electron= 35.09 barns/cc.

Radioactivity:

GRapi = 111.13 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Jarosite - barely detectable

Jarosite Classification

Dana Class:

30.2.5.1 (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.11-60 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 Jarosite Information

References:

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

See Also:

Links to other databases for Jarosite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - MinMax(Deutsch)
15 - MinMax(English)
16 - Mineral and Gemstone Kingdom
17 - Mineralienatlas (Deutsch)
18 - QUT Mineral Atlas
19 - Ruff.Info
20 - WWW-MINCRYST

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

Jarosite

KFe+++3(SO4)2(OH)6
Dana No: 30.2.5.1 Strunz No: VI/B.11-60
Locality:

Notes: