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Aluminocoquimbite

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Aluminocoquimbit
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Aluminocoquimbit

farblose Kristalle von Aluminocoquimbit, Grotta dell'Allume, Faraglione Nico, Porto Levante, Insel Vulcano, Sizilien, Italien; BB < 5 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-04-18
Locality: Grotta dell'Allume / Porto Levante / Vulcano, Insel / Äolische (Liparische) Inseln (Isole Eolie; Isole Lipari) / Messina, Provinz / Sizilien (Sicilia), Region / Italien

Collectors Summary

Cleavages unvollkommen (101)
Solubility nicht hygroskopisch und stabil an der Luft
Crystal System trigonal, P31c

Chemism

Chem­ical formula

Al2Fe2(SO4)6(H2O)12·6H2O

Chem­ical com­po­si­tion

Aluminium, Eisen, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 1066.3086284 u; Number of atoms in the formula: 88

Info

Empirical formula:

Al2Fe2(SO4)6(H2O)12·6H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

3.40

36

40.91

1.0079470

36.2860920
Oxygen

O

63.02

42

47.73

15.9994300

671.9760600
Aluminium

Al

5.06

2

2.27

26.9815382

53.9630764
Sulfur

S

18.04

6

6.82

32.0655000

192.3930000
Iron

Fe

10.47

2

2.27

55.8452000

111.6904000

Anal­y­sis wt%

SO3 : 44.24, Al2O3 : 10.30, Fe2O3 : 13.96, H2O : 31.50 (Ref: Canadian Mineralogist 2010)

Strunz 9th edi­tion incl. updates

7.CB.50

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
C: Sulfate (Selenate, etc.) ohne weitere Anionen, mit H2O
B: Mit ausschließlich mittelgroßen Kationen
50:Coquimbit-Gruppe

Lapis Clas­sifica­tion

VI/C.08-035

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
C: Wasserhaltige Sulfate, ohne fremde Anionen
8: Mittelgroße Kationen

Clas­sifica­tion by Hölzel

7.CC.213

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
C: Sulfates (-Anions +Water)
C: Alunogen-Group

IMA sta­tus

anerkannt - März 2010, IMA 2009-094, CNMNC Newsletter, April 2010, page 376; Mineralogical Magazine, 74, 375-377.

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

max. Birefrin­gence

0.020
Birefringence chart\! Aluminocoquimbite title=Birefringence chart Aluminocoquimbite

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

1.53

RI value γ / ε

1.56

Ri mean

1.540

2V angle

Uniaxial (+)

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3m

Space Group number

163

Space Group

P31c

Cell param­e­ters a (Å)

10.707

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

17.308

Cell param­e­ters a/b or c/a

1.617

Cell param­e­ters c/b

-

Z

2

Volumne (ų)

1718.356

Kristall struc­ture

Struktur bestimmt

X-Ray Pow­der Diffrac­tion

9.251(100), 8.710(13), 5.310(83), 4.087(33),
3.365(13), 3.152(43), 2.112(17), 1.765(20)
XRD chart Aluminocoquimbite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.061 ( ρ calc. Mineralienatlas )

Cleav­ages

unvollkommen (101)

Insta­bil­ity

nicht hygroskopisch und stabil an der Luft

(Co-)Type locality

(Co-)Type locality

Italien/Sizilien (Sicilia), Region/Messina, Provinz/Äolische (Liparische) Inseln (Isole Eolie; Isole Lipari)/Vulcano, Insel/Porto Levante/Grotta dell'Allume

Type mate­r­ial

Das Typ-Material wurde in der Refferenc Sammlung des Dipartimento di Chimica Strutturale e Stereochimica Inorganica, Universität von Milan gelagert

Col­lec­tion number of type mate­r­ial

2009-03

Preface

Author (Name, Year)

Demartin, F., Castellano, C., Gramaccioli, C.M. und Campostrini, I., 2

References

IMA 2009-094, CNMNC Newsletter, April 2010, page 376; Mineralogical Magazine, 74, 375-377.

American Mineralogist, Volume 98, pages 279–282, 2013

CNMNC Newsletter 52, October (2019) IMA 19-F: Redefinition of coquimbite; Proposal 19-F is accepted, and coquimbite is redefined as AlFe3(SO4)6(H2O)12·6H2O (Z = 2). Neotype material is the sample studied by Fang and Robinson (1970) from the Tierra Amarilla (the original type locality described by Rose, 1833) and kept in the U.S. National Museum, Washington DC, USA, catalogue number 12548. In order to be compared with coquimbite, the chemical formulae of paracoquimbite and aluminocoquimbite are also redefined as Fe4(SO4)6(H2O)12·6H2O (Z = 6) and Al2Fe2(SO4)6(H2O)12·6H2O (Z = 2), respectively. Coquimbite and paracoquimbite are characterised by homeotypic structures, so they constitute the ‘coquimbite group’. Aluminocoquimbite, characterised by a different topology, does not belong to the coquimbite group.
Daniela Mauro; Cristian Biagioni; Marco Pasero; Henrik Skogby; Federica Zaccarini: Redefinition of coquimbite, AlFe3+3(SO4)6(H2O)12⋅6H2O. Mineralogical Magazine Vol. 84, Nr. 2 (2020) S. 275-282.

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

Coquimbite

AlFe3(SO4)6(H2O)12·6H2O

trigonal : 3m : P31c

7.CB.50

Aluminocoquimbite

Al2Fe2(SO4)6(H2O)12·6H2O

trigonal : 3m : P31c

7.CB.50

Paracoquimbite

Fe4(SO4)6(H2O)12·6H2O

trigonal : 3 : R3

7.CB.50

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

Rhomboclase

(H5O2)+Fe3+(SO4)2·2H2O

orthorhombisch : mmm : Pnma

VI/C.08-010

Lausenite

Fe23+(SO4)3·6H2O

monoklin : 2/m : P21/m

VI/C.08-020

Kornelite

Fe23+(SO4)3·7H2O

monoklin : 2/m : P21/n

VI/C.08-030

Aluminocoquimbite

Al2Fe2(SO4)6(H2O)12·6H2O

trigonal : 3m : P31c

VI/C.08-035

Coquimbite

AlFe3(SO4)6(H2O)12·6H2O

trigonal : 3m : P31c

VI/C.08-040

Paracoquimbite

Fe4(SO4)6(H2O)12·6H2O

trigonal : 3 : R3

VI/C.08-050

Quenstedtite

Fe23+(SO4)3·10 H2O

triklin : 1 : P1

VI/C.08-060

Alunogen

Al2(SO4)3·17H2O

triklin : 1 : P1

VI/C.08-070

'Meta-alunogen'

Al4(SO4)6·27H2O

VI/C.08-080

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

Kornelite

Fe23+(SO4)3·7H2O

monoklin : 2/m : P21/n

7.CC.200

Paracoquimbite

Fe4(SO4)6(H2O)12·6H2O

trigonal : 3 : R3

7.CC.210

Coquimbite

AlFe3(SO4)6(H2O)12·6H2O

trigonal : 3m : P31c

7.CC.211

Aluminocoquimbite

Al2Fe2(SO4)6(H2O)12·6H2O

trigonal : 3m : P31c

7.CC.213

Quenstedtite

Fe23+(SO4)3·10 H2O

triklin : 1 : P1

7.CC.220

Other languages

German

Aluminocoquimbit

English

Aluminocoquimbite

Russian

Алюминококимбит

IMA Number

IMA 2009-095

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

German pages

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

English pages

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

Russian pages

 Webmineral.ru - search for: Алюминококимбит

Mineral Dealer

German pages

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