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Natroalunite-2c

Additional Functions

Collectors Summary

Color weiß, nahezu farblos
Streak color weiß
Lustre Glasglanz, Perlglanz
Hardness (Mohs) 3 - 4
Solubility +++ Säuren
Crystal System trigonal, R3m

Chemism

Chem­ical formula

NaAl3(SO4)2(OH)6

Chem­ical com­po­si­tion

Aluminium, Natrium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 398.1050868 u; Number of atoms in the formula: 26

Info

Empirical formula:

NaAl3(SO4)2(OH)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.52

6

23.08

1.0079470

6.0476820

Oxygen

O

56.26

14

53.85

15.9994300

223.9920200

Sodium

Na

5.77

1

3.85

22.9897702

22.9897702

Aluminium

Al

20.33

3

11.54

26.9815382

80.9446146

Sulfur

S

16.11

2

7.69

32.0655000

64.1310000

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

Clas­sifica­tion by Hölzel

7.BB.500

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
B: Sulfates (+Anions -Water)
B: Alunite-Group (sulfatian)
5: Alunites-2R

Dana 8th edi­tion

30.02.04.05

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

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Alunite supergroup  ⇒ Alunite group with -2c

Optical Properties

Color

weiß, nahezu farblos

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent bis durchscheinend

Lus­tre

Glasglanz, Perlglanz

max. Birefrin­gence

0.024

Birefringence chart\! Natroalunite-2c title=Birefringence chart Natroalunite-2c

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

1.604

RI value γ / ε

1.58

Ri mean

1,592

2V angle

Uniaxial (+)

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3m

Space Group number

166

Space Group

R3m

Cell param­e­ters a (Å)

6.981

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

33.49

Cell param­e­ters a/b or c/a

4.797

Cell param­e­ters c/b

-

Z

6

Volumne (ų)

1413.452

X-Ray Pow­der Diffrac­tion

5.591(60),
4.906(80),
3.493(30),
2.964(100),
2.792(80),
2.225(60),
1.897(40),
1.861(40)

XRD chart Natroalunite-2c

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 - 4

Density (g/cm³)

2.81 (berechnet) 2.8 (gemessen)

2.806 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ Säuren

Preface

Author (Name, Year)

Ossaka & Hirabayashi & Okada & Kobayashi & Hayashi, 1982

References

American Mineralogist 67 (1982), 114

IMA 07-D ALUNITE SUPERGROUP; The recommended nomenclature of the alunite supergroup is accepted. Minamiite is renamed natroalunite-2R. IMA-WEB-Seite Sept. 2009

P. Bayliss, U. Kolitsch, E.H. Nickel, A. Pring: Alunite supergroup: recommended nomenclature. Mineral. Mag. 74 (2010) S.919-927.

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

Na2Al3(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 "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Natroalunite-2c

NaAl3(SO4)2(OH)6

trigonal : 3m : R3m

7.BB.500

Walthierite

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

trigonal : 3m : R3m

7.BB.530

Plumbojarosite

PbFe63+(SO4)4(OH)12

trigonal : 3m : R3m

7.BB.550

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

Na2Al3(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

Other languages

German

Natroalunit-2c

English

Natroalunite-2c

old name

German

Minamiit

Minamiit wurde umbenannt zu Natroalunit-2c

English

Minamiite

Minamiite is renamed natroalunite-2c

Spanish

Minamiíta

English

Natroalunite-2R

Russian

Минамиит

IMA Number

IMA 1980-095

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

German pages

DeWikiPedia - search for: Natroalunit-2c
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Mineralogisch-Petrographisches-Institut Hamburg - search for: Natroalunit-2c

English pages

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