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Alunite

Pictures (18 Images total)

Alunit
Views (Image: 1371111735): 4177
Alunit

Bildbreite: 2,5 mm; Fundort: Grube Käusersteimel, Kausen, Siegerland, Rheinland-Pfalz, Deutschland

Collection: Matthias Reinhardt
Copyright: Matthias Reinhardt
Contribution: Hg 2013-06-13
Locality: Grube Käusersteimel / Kausen / Altenkirchen (Westerwald), Kreis / Rheinland-Pfalz / Deutschland
faseriger farblos-weißer Alunit
Views (Image: 1592726177): 760
faseriger farblos-weißer Alunit (SNr: A004365)

Italien/Sizilien (Sicilia), Region/Messina, Provinz/Äolische (Liparische) Inseln (Isole Eolie; Isole Lipari)/Vulcano, Insel, BB = 5,0 mm

Collection: Lithothek der Münchener Micromounter
Copyright: husi
Contribution: Münchener Micromounter 2020-06-21
Locality: Vulcano, Insel / Äolische (Liparische) Inseln (Isole Eolie; Isole Lipari) / Messina, Provinz / Sizilien (Sicilia), Region / Italien
Alunit
Views (Image: 1328541123): 5493
Alunit

Größe: 0,8 x 0,8 x 0,6 cm, Fundort: Marysvale District (Marysvale Uranium area), Piute Co., Utah, USA

Copyright: Michael Roarke
Contribution: thdun5 2012-02-06
Locality: Marysvale District / Piute Co. / Utah / USA
Alunit xx
Views (Image: 1462046091): 3318
Alunit xx

FO: Leider nicht bekannt; Bildbreite ca. 16mm

Collection: etalon
Copyright: etalon
Contribution: etalon 2016-04-30
Alunit-Supergruppe
Views (Image: 1586024187): 860
Alunit-Supergruppe

FO: Grube Clara / Oberwolfach; BB 1 mm

Copyright: Halden-Joerg
Contribution: Halden-Joerg 2020-04-04
Locality: Grube Clara / Oberwolfach / Ortenaukreis / Freiburg, Bezirk / Baden-Württemberg / Deutschland
Alunit xx
Views (Image: 1175362549): 6688
Alunit xx

Fundort: Montioni, Livorno, Italien; Bildbreite 20 mm

Copyright: loismin
Contribution: loismin 2007-03-31
Locality: Montioni / Suvereto / Livorno, Provinz / Toskana (Toscana) / Italien

Collectors Summary

Color farblos bis weiß, verschiedentlich blass gefärbt
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 3.50 - 4.00
Solubility + verdünnte H2SO4, +- HCl, HNO3, - H2O
Crystal System trigonal, R3m

Chemism

Chem­ical formula

KAl3(SO4)2(OH)6

Chem­ical com­po­si­tion

Aluminium, Kalium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 414.2136266 u; Number of atoms in the formula: 26

Info

Empirical formula:

KAl3(SO4)2(OH)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.46

6

23.08

1.0079470

6.0476820

Oxygen

O

54.08

14

53.85

15.9994300

223.9920200

Aluminium

Al

19.54

3

11.54

26.9815382

80.9446146

Sulfur

S

15.48

2

7.69

32.0655000

64.1310000

Potassium

K

9.44

1

3.85

39.0983100

39.0983100

Anal­y­sis wt%

K2O : 10.46, Al2O3 : 37.18, SO3 : 38.34, H2O : 12.99, P2O5 : 0.58 (Ref: Dana, 7th ed. 2)

Strunz 9th edi­tion incl. updates

7.BC.10

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
B: Sulfate (Selenate, etc.) mit weitere Anionen, ohne H2O
C: Mit mittelgroßen und großen [Kationen]
10:Alunit-Gruppe

Lapis Clas­sifica­tion

VI/B.11-020

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
B: Wasserfreie Sulfate, mit fremden Anionen
11: Große Kationen vor-wiegend; Alunit-Gruppe

Clas­sifica­tion by Hölzel

7.BB.110

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
B: Sulfates (+Anions -Water)
B: Alunite-Group (sulfatian)
1: Alunites with alkalies, Ag, Tl

Dana 8th edi­tion

30.02.04.01

30: Anhydrous Sulfates Containing Hydroxyl or Halogen
02: Anhydrous Sulfates Containing Hydroxyl or Halogen where (A B)2 XO4 Zq
04: Alunite Group (Alunite Subgroup)

IMA sta­tus

Mit Anerkennung der CNMNC umbenannt

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Alunite supergroup  ⇒ Alunite group with -1c

Optical Properties

Color

farblos bis weiß, verschiedentlich blass gefärbt

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent, durchscheinend

Lus­tre

Glasglanz

max. Birefrin­gence

0.022

Birefringence chart\! Alunite title=Birefringence chart Alunite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.590-1.601

RI value γ / ε

1.568-1.585

Ri mean

1.586

2V angle

Uniaxial (+)

Optical Data Luminescence

Color LW-UV (365nm)

 

gelblich weiß

Color SW-UV (254nm)

 

gelblich weiß

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3m

Space Group number

166

Space Group

R3m

Cell param­e­ters a (Å)

7.02

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

17.223

Cell param­e­ters a/b or c/a

2.453

Cell param­e­ters c/b

-

Z

3

Volumne (ų)

735.045

X-Ray Pow­der Diffrac­tion

5.76(10),
4.98(40),
3.52(30),
3.00(100),
2.284(20),
1.920(20),
1.755(10),
1.498(10)

XRD chart Alunite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

3.50 - 4.00

VHN (Hard­ness Vick­ers)

160 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.75

2.807 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+ verdünnte H2SO4, +- HCl, HNO3, - H2O

Chem­ical Prop­er­ties and Tests

In H2O und HCl unlöslich, in KOH und heißer H2SO4 löslich.

Preface

Author (Name, Year)

Beudant, 1824

Rel­evance, Usage

Wird zur Herstellung von Alaun verwendet.

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 13

R. E. Stoffregen, C. N. Alpers, J. L. Jambor: Alunite-Jarosite Crystallography, Thermodynamics, and Geochronology. Reviews in Mineralogy and Geochemistry 40 (2000) S.453-479.

IMA group assignments

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Alunite

KAl3(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Huangite

Ca0.5Al3[(OH)6|(SO4)2]

trigonal : 3m : R3m

7.BC.10

Jarosite

KFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Walthierite

Ba0.5Al3(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Natroalunite-1c

NaAl3(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Osarizawaite

Pb(Al2Cu2+)(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Dorallcharite

(Tl,K)Fe3+3[(OH)6|(SO4)2]

trigonal : 3m : R3m

7.BC.10

Natrojarosite

NaFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Ammonioalunite

NH4Al3(SO4)2(OH)6

trigonal : 3m, 3m : R3m, R3m

7.BC.10

Beaverite-(Cu)

Pb(Fe3+2Cu)(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Plumbojarosite

PbFe63+(SO4)4(OH)12

trigonal : 3m : R3m

7.BC.10

Ammoniojarosite

NH4Fe3+3(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Argentojarosite

AgFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Beaverite-(Zn)

Pb(Fe3+2Zn)(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Natroalunite-2c

NaAl3(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Schlossmacherite

(H3O,Ca)Al3(AsO4,SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Hydronium jarosite

(H3O)Fe3+3(SO4)2(OH)6

trigonal : 3m : R3m

7.BC.10

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Natroalunite-1c

NaAl3(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-010

Alunite

KAl3(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-020

Ammonioalunite

NH4Al3(SO4)2(OH)6

trigonal : 3m, 3m : R3m, R3m

VI/B.11-030

Huangite

Ca0.5Al3[(OH)6|(SO4)2]

trigonal : 3m : R3m

VI/B.11-043

Walthierite

Ba0.5Al3(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-045

Natrojarosite

NaFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-050

Jarosite

KFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-060

Dorallcharite

(Tl,K)Fe3+3[(OH)6|(SO4)2]

trigonal : 3m : R3m

VI/B.11-065

Ammoniojarosite

NH4Fe3+3(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-070

Hydronium jarosite

(H3O)Fe3+3(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-080

Argentojarosite

AgFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-090

Plumbojarosite

PbFe63+(SO4)4(OH)12

trigonal : 3m : R3m

VI/B.11-100

Osarizawaite

Pb(Al2Cu2+)(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-110

Beaverite-(Zn)

Pb(Fe3+2Zn)(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-115

Beaverite-(Cu)

Pb(Fe3+2Cu)(SO4)2(OH)6

trigonal : 3m : R3m

VI/B.11-120

Krivovichevite

Pb3[Al(OH)6](SO4)(OH)

trigonal : 3m : R3c

VI/B.11-130

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Natroalunite-1c

NaAl3(SO4)2(OH)6

trigonal : 3m : R3m

7.BB.100

Alunite

KAl3(SO4)2(OH)6

trigonal : 3m : R3m

7.BB.110

Natrojarosite

NaFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

7.BB.140

Jarosite

KFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

7.BB.145

Argentojarosite

AgFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

7.BB.160

Dorallcharite

(Tl,K)Fe3+3[(OH)6|(SO4)2]

trigonal : 3m : R3m

7.BB.170

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Lanarkite

Pb2(SO4)O

monoklin : 2/m : C2/m

30.02.01.01

Dolerophanite

Cu2(SO4)O

monoklin : 2/m : C2/m

30.02.02.01

Linarite

PbCu(SO4)(OH)2

monoklin : 2/m : P21/m

30.02.03.01

Alunite

KAl3(SO4)2(OH)6

trigonal : 3m : R3m

30.02.04.01

Natroalunite-1c

NaAl3(SO4)2(OH)6

trigonal : 3m : R3m

30.02.04.02

Schlossmacherite

(H3O,Ca)Al3(AsO4,SO4)2(OH)6

trigonal : 3m : R3m

30.02.04.03

Osarizawaite

Pb(Al2Cu2+)(SO4)2(OH)6

trigonal : 3m : R3m

30.02.04.04

Natroalunite-2c

NaAl3(SO4)2(OH)6

trigonal : 3m : R3m

30.02.04.05

Ammonioalunite

NH4Al3(SO4)2(OH)6

trigonal : 3m, 3m : R3m, R3m

30.02.04.06

Walthierite

Ba0.5Al3(SO4)2(OH)6

trigonal : 3m : R3m

30.02.04.07

Huangite

Ca0.5Al3[(OH)6|(SO4)2]

trigonal : 3m : R3m

30.02.04.08

Jarosite

KFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

30.02.05.01

Natrojarosite

NaFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

30.02.05.02

Hydronium jarosite

(H3O)Fe3+3(SO4)2(OH)6

trigonal : 3m : R3m

30.02.05.03

Ammoniojarosite

NH4Fe3+3(SO4)2(OH)6

trigonal : 3m : R3m

30.02.05.04

Argentojarosite

AgFe3+3(SO4)2(OH)6

trigonal : 3m : R3m

30.02.05.05

Plumbojarosite

PbFe63+(SO4)4(OH)12

trigonal : 3m : R3m

30.02.05.06

Beaverite-(Cu)

Pb(Fe3+2Cu)(SO4)2(OH)6

trigonal : 3m : R3m

30.02.05.07

Dorallcharite

(Tl,K)Fe3+3[(OH)6|(SO4)2]

trigonal : 3m : R3m

30.02.05.08

Itoite

Pb3GeO2(SO4)2(OH)2

orthorhombisch : mmm : Pnma

30.02.06.01

Piypite

K4Cu4O2(SO4)4·(Na,Cu)Cl

tetragonal : 4 : I4

30.02.07.01

Kamchatkite

KCu32+OCl(SO4)2

orthorhombisch : mm2 : Pna21

30.02.08.01

Cannonite

Bi2O(SO4)(OH)2

monoklin : 2/m : P21/c

30.02.09.01

Alternative Name

German

Alaun-Grammit

German

Alaunspat

German

Alaunstein (of Werner)

Alum de Rome

Latin

Alumen de Tolpha

German

Aluminilit

Spanish

Aluminilita

English

Aluminilite

Alumstone

Calafatite

English

Ferroalunite

Ignatiewite

German

K-Alunit

K-Alunite

German

Kalioalunit

Spanish

Kalioalunita

English

Kalioalunite

German

Lowigit

Spanish

Lowigita

Lowigite

German

Lœvigit

Spanish

Lœvigita

Lœvigite

German

Lœwigit

Spanish

Lœwigita

Lœwigite

Newtonite

French

Pierre alumineuse de la Tolfa

Swedish

Romersk Alunsten

CNMNC symbol

Symbol

Alu

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Alunit
Google-Bilder-Suche - search for: Alunit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Alunit

English pages

Mindat - search for: Alunite
Webmineral - search for:Alunite
Handbook-of-Mineralogy - search for: Alunite
RRUFF - Raman, XRD and other mineral data - search for: Alunite
RRUFF - References and PDF downloads - search for: Alunite
American-Mineralogist-Crystal-Structure-Database - search for: Alunite
Athena - search for: Alunite

Russian pages

Webmineral.ru - search for: Алунит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Alunit
Crystal-Treasure.com - search for: Alunit
Bosse - search for: Alunit

Locations with GPS information