Mineralogy Database

Jarosite Mineral Data

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General Jarosite Information

Help on Chemical Formula: Chemical Formula: KFe+++3(SO4)2(OH)6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: KFe3+3(SO4)2(OH)6
Help on Environment: Environment: Secondary mineral, forming under conditions of weathering in arid climates.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1852
Help on Locality: Locality: Barranco Jaroso in southern Spain. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Jarosite Say JAROSITE
Help on Synonym: Synonym: ICSD 12107
  PDF 36-427
  Utahite
 

Jarosite Image

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  Alunogen   Jarosite

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
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  Fairbankite   Jarosite

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
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  Jarosite

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

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
Help on Axial Ratios: Axial Ratios: a:c = 1:2.36199
Help on Cell Dimensions: Cell Dimensions: a = 7.21, c = 17.03, Z = 3; V = 766.68 Den(Calc)= 3.25
Help on Crystal System: Crystal System: Trigonal - Pyramidal H-M Symbol (3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.08(1), 3.11(0.6), 2.292(0.5),
Help on Forms: Forms:

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Forms: ( 1 1 1) ( 1 1 2) ( 0 0 1)

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Physical Properties of Jarosite

Help on Cleavage: Cleavage: {0001} Distinct
Help on Color: Color: Brown, Yellow, Yellow brown, Light yellow.
Help on Density: Density: 2.9 - 3.3, Average = 3.09
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 2.5-3.5 - Finger Nail-Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow
 

Optical Properties of Jarosite

Help on Dichroism (e): Dichroism (e): colorless, very pale yellow, or pale greenish yellow.
Help on Dichroism (w): Dichroism (w): colorless, deep golden yellow, or deep golden yellow.
Help on Gladstone-Dale: 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
Ncalc = 1.76 - 1.87
Help on Optical Data: Optical Data: Uniaxial (-), e=1.713-1.715, w=1.815-1.82, bire=0.1020-0.1050.
 

Calculated Properties of Jarosite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.06 gm/cc
note: Specific Gravity of Jarosite =3.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0082785281
Boson Index = 0.9917214719
Help on Photoelectric: Photoelectric: PEJarosite = 11.47 barns/electron
U=PEJarosite x relectron= 35.09 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 111.13 (Gamma Ray American Petroleum Institute Units)
Concentration of Jarosite per GRapi unit = 0.90 (%)

Estimated Radioactivity from Jarosite - barely detectable

 

Jarosite Classification
Help on Dana Class: Dana Class: 30.02.05.01 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen
  (30.02)where (A B)2 XO4 Zq
  (30.02.05)Alunite Group (Jarosite Subgroup)
 
30.02.05.01 Jarosite KFe3(SO4)2(OH)6 R 3 3
 
30.02.05.02 Natrojarosite NaFe3(SO4)2(OH)6 R 3m 3m
 
30.02.05.03 Hydroniumjarosite (H3O)Fe3(SO4)2(OH)6 R 3m 3m
 
30.02.05.04 Ammoniojarosite (NH4)Fe3(SO4)2(OH)6 R 3m 3m
 
30.02.05.05 Argentojarosite AgFe3(SO4)2(OH)6 R 3m 3m
 
30.02.05.06 Plumbojarosite PbFe6(SO4)4(OH)12 R 3m 3 2/m
 
30.02.05.07 Beaverite PbCu(Fe,Al)2(SO4)2(OH)6 R 3m 3m
 
30.02.05.08 Dorallcharite (Tl,K)Fe3(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 Jarosite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: 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 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineral and Gemstone Kingdom
16 - Mineralienatlas (Deutsch)
17 - Online Mineral Museum
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: 30.02.05.01 Strunz No: 07.BC.10
Locality:

 

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