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Alum-(K)

Pictures (4 Images total)

Kalialaun
Views (Image: 1526660971): 1501
Kalialaun

BB-20 mm Deutschland/Nordrhein-Westfalen/Arnsberg, Bezirk/Märkischer Kreis/Iserlohn/Letmathe/Genna Zinkhütte

Collection: anatase2
Copyright: Joerg M.
Contribution: anatase2 2018-05-18
Locality: Genna Zinkhütte / Letmathe / Iserlohn / Märkischer Kreis / Arnsberg, Bezirk / Nordrhein-Westfalen / Deutschland
Alaun-K
Views (Image: 1417541488): 5442
Alaun-K

Bildbreite: 1,5 mm. Fundort: Im Kalkes, Bebra - Iba, Richelsdorfer Gebirge, Hessen, Deutschland.

Collection: Werner Simon
Copyright: Werner Simon
Contribution: Steinkautz 2014-12-02
Locality: Im Kalkes / Iba / Bebra / Richelsdorfer Gebirge / Hersfeld-Rotenburg, Landkreis / Kassel, Bezirk / Hessen / Deutschland
Alaun-K
Views (Image: 1417541250): 4465
Alaun-K

Bildbreite: 3 mm; Fundort: Im Kalkes, Bebra - Iba, Richelsdorfer; Gebirge, Hessen, Deutschland.

Collection: Werner Simon
Copyright: Werner Simon
Contribution: Steinkautz 2014-12-02
Locality: Im Kalkes / Iba / Bebra / Richelsdorfer Gebirge / Hersfeld-Rotenburg, Landkreis / Kassel, Bezirk / Hessen / Deutschland
Alaunkritalle
Views (Image: 1451128797): 4687
Alaunkritalle

Alaunkristalle im Krater der Phlegräische Felder, Neapel, Italien. BB ca. 7 cm. 19.07.2015

Collection: Nathan
Copyright: Nathan
Contribution: Nathan 2015-12-26
Locality: Solfatara di Pozzuoli / Pozzuoli / Phlegräische Felder (Campi Flegrei) / Neapel, Provinz / Kampanien (Campania), Region / Italien

Collectors Summary

Color farblos, weiß
Lustre Glasglanz
Hardness (Mohs) 2 - 2.5
Solubility +++ H2O
Crystal System kubisch, Pa3

Chemism

Chem­ical formula

KAl(SO4)2·12H2O

Chem­ical com­po­si­tion

Aluminium, Kalium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 474.3901762 u; Number of atoms in the formula: 48

Info

Empirical formula:

KAl(SO4)2·12H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

5.10

24

50.00

1.0079470

24.1907280

Oxygen

O

67.45

20

41.67

15.9994300

319.9886000

Aluminium

Al

5.69

1

2.08

26.9815382

26.9815382

Sulfur

S

13.52

2

4.17

32.0655000

64.1310000

Potassium

K

8.24

1

2.08

39.0983100

39.0983100

Strunz 9th edi­tion incl. updates

7.CC.20

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

Lapis Clas­sifica­tion

VI/C.14-020

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
C: Wasserhaltige Sulfate, ohne fremde Anionen
14: Mittelgroße und sehr große Kationen

Clas­sifica­tion by Hölzel

7.CD.110

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
C: Sulfates (-Anions +Water)
D: Sulfates, C medium + large
1: Alum-Group

Hey's Chem­ical Index of Min­er­als

25.06.17

25: Sulphates
06: Sulphates of Al and Tl

Dana 8th edi­tion

29.05.05.01

29: Hydrated Acid and Sulfates
05: Hydrated Acid and Sulfates where A B (XO4)2 · x(H2O)
05: Alum Group

IMA sta­tus

Erstbeschreibung vor IMA-Gründung 1959, vererbt, meist als Mineral von der CNMNC anerkannt

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos, weiß

Diaphane­ity (Trans­parency)

transparent

Lus­tre

Glasglanz

RI value α / ω / n

1.456

Ri mean

1.456

2V angle

Isotropisch

Crystallography

Crystal Sys­tem

kubisch

Class (H-M)

m3

Space Group number

205

Space Group

Pa3

Cell param­e­ters a (Å)

12.157

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

-

Cell param­e­ters a/b or c/a

1

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

1796.715

X-Ray Pow­der Diffrac­tion

5.44(40),
4.96(20),
4.298(100),
4.053(40),
3.250(50),
3.039(20),
2.950(20),
2.789(30)

XRD chart Alum-(K)

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)

2 - 2.5

VHN (Hard­ness Vick­ers)

42 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

1.75 (gemessen) 1.753 (berechnet)

1.754 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ H2O

Preface

Author (Name, Year)

Vauquelin, 1797

References

Frondel, C. - American Mineralogist 25 (1940), 91.

USA National Bureau of Standards Circular 539, 6 (1956), 36.

Acta Crystallographica 22 (1967), 793.

John L. Jambor, D. Kirk Nordstrom, Charles N. Alpers: Metal-sulfate Salts from Sulfide Mineral Oxidation. Reviews in Mineralogy and Geochemistry 40 (2000) S.303-350.

Acta Crystallographica B56 (2000), 204.

Crystallography Reports 45 (2000), 919.

Handbook of Mineralogy (Anthony u.w.), 5 (2003), 561.

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

Alum-(K)

KAl(SO4)2·12H2O

kubisch : m3 : Pa3

7.CC.20

Lonecreekite

(NH4)(Fe3+,Al)(SO4)2·12H2O

kubisch : m3 : Pa3

7.CC.20

Tschermigite

(NH4)Al(SO4)2·12H2O

kubisch : m3 : Pa3

7.CC.20

Lanmuchangite

TlAl[SO4]2·12H2O

kubisch : m3 : Pa3

7.CC.20

Alum-(Na)

NaAl(SO4)2·12H2O

kubisch : m3 : Pa3

7.CC.20

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

Alum-(Na)

NaAl(SO4)2·12H2O

kubisch : m3 : Pa3

VI/C.14-010

Alum-(K)

KAl(SO4)2·12H2O

kubisch : m3 : Pa3

VI/C.14-020

Tschermigite

(NH4)Al(SO4)2·12H2O

kubisch : m3 : Pa3

VI/C.14-030

Lonecreekite

(NH4)(Fe3+,Al)(SO4)2·12H2O

kubisch : m3 : Pa3

VI/C.14-040

Lanmuchangite

TlAl[SO4]2·12H2O

kubisch : m3 : Pa3

VI/C.14-045

Pertlikite

K2(Fe2+,Mg)2(Mg,Fe3+)4Fe3+2Al(SO4)12·18H2O

tetragonal : 4mm : I41cd

VI/C.14-048

Voltaite

K2Fe2+5Fe3+3Al(SO4)12·18H2O

kubisch : m3m : Fd3c

VI/C.14-050

Zincovoltaite

K2(Zn,Fe2+,Mn)5Fe33+Al(SO4)12·18H2O

kubisch : m3m : Fd3c

VI/C.14-060

Ammoniomagnesiovoltaite

(NH4)2Mg5Fe3+3Al(SO4)12·18H2O

kubisch : m3m : Fd3c

VI/C.14-070

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

Alum-(Na)

NaAl(SO4)2·12H2O

kubisch : m3 : Pa3

7.CD.100

Alum-(K)

KAl(SO4)2·12H2O

kubisch : m3 : Pa3

7.CD.110

Tschermigite

(NH4)Al(SO4)2·12H2O

kubisch : m3 : Pa3

7.CD.120

Lanmuchangite

TlAl[SO4]2·12H2O

kubisch : m3 : Pa3

7.CD.130

Lonecreekite

(NH4)(Fe3+,Al)(SO4)2·12H2O

kubisch : m3 : Pa3

7.CD.150

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

Krausite

KFe3+(SO4)2·H2O

monoklin : 2/m : P21/m

29.05.01.01

Goldichite

KFe3+(SO4)2·4H2O

monoklin : 2/m : P21/c

29.05.02.01

Tamarugite

NaAl(SO4)2·6H2O

monoklin : 2/m : P21/a

29.05.03.01

Amarillite

NaFe3+(SO4)2·6H2O

monoklin : 2/m : C2/c

29.05.03.02

Mendozite

NaAl(SO4)2·11H2O

monoklin : 2/m : C2/c

29.05.04.01

Alum-(K)

KAl(SO4)2·12H2O

kubisch : m3 : Pa3

29.05.05.01

Alum-(Na)

NaAl(SO4)2·12H2O

kubisch : m3 : Pa3

29.05.05.02

Tschermigite

(NH4)Al(SO4)2·12H2O

kubisch : m3 : Pa3

29.05.05.03

Lonecreekite

(NH4)(Fe3+,Al)(SO4)2·12H2O

kubisch : m3 : Pa3

29.05.05.04

Lanmuchangite

TlAl[SO4]2·12H2O

kubisch : m3 : Pa3

29.05.05.05

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

Alum-(K)

KAl(SO4)2·12H2O

kubisch : m3 : Pa3

25.06.17

Other languages

German

Alaun-(K)

English

Alum-(K)

French

Alun de potasse

Russian

Алюмокалиевые квасцы

Russian

Квасцы-(K)

Simplified Chinese

钾明矾

Alternative Name

K-alum

German

Kali-Alaun

German

Kalialaun

Native Alum

Spanish

Potasioalumbre

English

Potassium Alum

Simplified Chinese

钾明矾石

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

German pages

DeWikiPedia - search for: Alaun-(K)
Google-Bilder-Suche - search for: Alaun-(K)
Mineralogisch-Petrographisches-Institut Hamburg - search for: Alaun-(K)

English pages

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Handbook-of-Mineralogy - search for: Alum-(K)
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RRUFF - References and PDF downloads - search for: Alum-(K)
American-Mineralogist-Crystal-Structure-Database - search for: Alum-(K)
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Russian pages

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German pages

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