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Pictures (18 Images total)

Views (Image: 1371111735): 4177

Alunit

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

Collection:

Matthias Reinhardt

Contribution: Hg 2013-06-13

Locality: Grube Käusersteimel / Kausen / Altenkirchen (Westerwald), Kreis / Rheinland-Pfalz / Deutschland

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

husi

Contribution: Münchener Micromounter 2020-06-21

Locality: Vulcano, Insel / Äolische (Liparische) Inseln (Isole Eolie; Isole Lipari) / Messina, Provinz / Sizilien (Sicilia), Region / Italien

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

Michael Roarke

Contribution: thdun5 2012-02-06

Locality: Marysvale District / Piute Co. / Utah / USA

Views (Image: 1462046091): 3318

Alunit xx

FO: Leider nicht bekannt; Bildbreite ca. 16mm

Collection:

etalon

Contribution: etalon 2016-04-30

Views (Image: 1586024187): 860

Alunit-Supergruppe

FO: Grube Clara / Oberwolfach; BB 1 mm

Halden-Joerg

Contribution: Halden-Joerg 2020-04-04

Locality: Grube Clara / Oberwolfach / Ortenaukreis / Freiburg, Bezirk / Baden-Württemberg / Deutschland

Views (Image: 1175362549): 6688

Alunit xx

Fundort: Montioni, Livorno, Italien; Bildbreite 20 mm

loismin

Contribution: loismin 2007-03-31

Locality: Montioni / Suvereto / Livorno, Provinz / Toskana (Toscana) / Italien

More images

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

Search for minerals with similar chemistry

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

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 (Å³)	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)
	Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

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Crystal Structure 3D

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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.

(Co-)Type locality

Italien /Latium (Lazio), Region /Rom, Provinz /Tolfa

Ukraine /Transkarpatien, Oblast /Berehowe, Rajon /Berehowe /Muzhievo Goldlagerstätte

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	Ca_0.5Al₃[(OH)₆\|(SO₄)₂] trigonal : 3m : R3m	7.BC.10
Jarosite	KFe³⁺₃(SO₄)₂(OH)₆ trigonal : 3m : R3m	7.BC.10
Walthierite	Ba_0.5Al₃(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	Ca_0.5Al₃[(OH)₆\|(SO₄)₂] trigonal : 3m : R3m	VI/B.11-043
Walthierite	Ba_0.5Al₃(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	Ba_0.5Al₃(SO₄)₂(OH)₆ trigonal : 3m : R3m	30.02.04.07
Huangite	Ca_0.5Al₃[(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