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Paracoquimbite

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Paracoquimbit
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Paracoquimbit

Bildbreite: 10 mm; Fundort: Hydro-Sulfatstollen, Plaka, Lavrion, Griechenland

Copyright: Fritz Schreiber
Contribution: Hg 2007-05-22
Locality: Hydro-Sulfatstollen / Plaka, Revier / Lavrion (Laurion), Bergbaudistrikt / Attika (Attikí, Attica) / Griechenland

Collectors Summary

Color hellviolett
Hardness (Mohs) 2.5
Solubility +++ H2O, Aufbewahren in einem versiegelten Behälter
Crystal System trigonal, R3

Chemism

Chem­ical formula

Fe4(SO4)6(H2O)12·6H2O

Chem­ical com­po­si­tion

Eisen, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 1124.035952 u; Number of atoms in the formula: 88

Info

Empirical formula:

Fe4(SO4)6(H2O)12·6H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

3.23

36

40.91

1.0079470

36.2860920

Oxygen

O

59.78

42

47.73

15.9994300

671.9760600

Sulfur

S

17.12

6

6.82

32.0655000

192.3930000

Iron

Fe

19.87

4

4.55

55.8452000

223.3808000

Anal­y­sis wt%

Fe2O3 : 29.79, SO3 : 41.38, H2O : 28.69 (Ref: Bulletin de Mineralogie 35)

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.08-050

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

Clas­sifica­tion by Hölzel

7.CC.210

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

Dana 8th edi­tion

29.08.04.01

29: Hydrated Acid and Sulfates
08: Hydrated Acid and Sulfates where (A)2 (XO4)3 · x(H2O)

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

hellviolett

Diaphane­ity (Trans­parency)

transparent

max. Birefrin­gence

0.005

Birefringence chart\! Paracoquimbite title=Birefringence chart Paracoquimbite

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

1.550

RI value γ / ε

1.555

Ri mean

1.552

2V angle

Uniaxial (+)

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3

Space Group number

148

Space Group

R3

Cell param­e­ters a (Å)

10.926

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

51.30

Cell param­e­ters a/b or c/a

4.695

Cell param­e­ters c/b

-

Z

6

Volumne (ų)

5303.595

X-Ray Pow­der Diffrac­tion

8.88(100),
8.55(20),
7.616(40),
5.465(30),
4.713(20),
4.605(30),
3.367(30),
2.761(10)

XRD chart Paracoquimbite

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)

2.5

VHN (Hard­ness Vick­ers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.11

2.111 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ H2O, Aufbewahren in einem versiegelten Behälter

Preface

Author (Name, Year)

Ungemach, 1933

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 527

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

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

Lausenite

Fe23+(SO4)3·6H2O

monoklin : 2/m : P21/m

29.08.01.01

Kornelite

Fe23+(SO4)3·7H2O

monoklin : 2/m : P21/n

29.08.02.01

Coquimbite

AlFe3(SO4)6(H2O)12·6H2O

trigonal : 3m : P31c

29.08.03.01

Paracoquimbite

Fe4(SO4)6(H2O)12·6H2O

trigonal : 3 : R3

29.08.04.01

Quenstedtite

Fe23+(SO4)3·10 H2O

triklin : 1 : P1

29.08.05.01

Alunogen

Al2(SO4)3·17H2O

triklin : 1 : P1

29.08.06.01

Other languages

German

Paracoquimbit

Spanish

Paracoquimbita

English

Paracoquimbite

French

Paracoquimbite

Russian

Паракокимбит

Simplified Chinese

副针绿矾

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

German pages

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

English pages

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Handbook-of-Mineralogy - search for: Paracoquimbite
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RRUFF - References and PDF downloads - search for: Paracoquimbite
American-Mineralogist-Crystal-Structure-Database - search for: Paracoquimbite
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Russian pages

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German pages

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