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Coquimbite (Coquimbit)

Pictures (16 Images total)

Coquimbit
Views (File:
1295130096
): 2389
Coquimbit
Javier Ortega Mine, Dept. Ayacucho, Peru, 76x40 mm
Copyright: Embarak; Contribution: Embarak
Collection: Embarak
Location: Peru/Ayacucho, Region/Lucanas, Provinz/Huac-Huas, Distrikt/Javier Mine (Javier Ortega Mine)
Mineral: Coquimbite
Image: 1295130096
Rating: 7.67 (votes: 3)
License: Usage for Mineralienatlas project only
Coquimbit

Javier Ortega Mine, Dept. Ayacucho, Peru, 76x40 mm
Collection: Embarak
Copyright: Embarak
Contribution: Embarak 2011-01-15
Locality: Javier Mine (Javier Ortega Mine) / Huac-Huas, Distrikt / Lucanas, Provinz / Ayacucho, Region / Peru
Coquimbit; BB 6,0 mm
Views (File:
1241196865
): 2905
Coquimbit; BB 6,0 mm
Fundort: Dexter Mine No. 7 Mine, Calf Mesa, Emery Co., Utah
Copyright: Hannes Osterhammer; Contribution: eschuhbauer
Collection: Lithothek der Münchener Micromounter, Collection number: B003894, Donator: eschuhbauer
Location: USA/Utah/Emery Co./San Rafael District/Calf Mesa/Dexter No.7 Mine
Mineral: Coquimbite
Image: 1241196865
Rating: 6.5 (votes: 2)
License: Usage for Mineralienatlas project only
Coquimbit; BB 6,0 mm (SNr: B003894)

Fundort: Dexter Mine No. 7 Mine, Calf Mesa, Emery Co., Utah
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: eschuhbauer 2009-05-01
Locality: Dexter No.7 Mine / Calf Mesa / San Rafael District / Emery Co. / Utah / USA
Coquimbit
Views (File:
1108539740
): 2755
Coquimbit
mit gelbem Copiapit; Stufengröße: rd. 4 x 2,5 cm; Fundort: Copiapo-Bergbaurevier, III. Region, Chile
Copyright: McSchuerf; Contribution: Mineralienatlas
Location: Chile/Atacama, Region (III. Region)/Copiapó, Provinz
Mineral: Coquimbite
Image: 1108539740
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Coquimbit

mit gelbem Copiapit; Stufengröße: rd. 4 x 2,5 cm; Fundort: Copiapo-Bergbaurevier, III. Region, Chile
Copyright: McSchuerf
Contribution: Mineralienatlas 2005-02-16
Locality: Copiapó, Provinz / Atacama, Region (III. Region) / Chile
Coquimbit
Views (File:
1295794164
): 942
Coquimbit
Bildbreite: 4,5 mm, Fundort: Alcaparrosa Mine, Cerritos Bayos, Calama, Provinz Antofagasta, Chile
Copyright: Enrico Bonacina; Contribution: thdun5
Collection: Domenico Preite
Location: Chile/Antofagasta, Region (II. Region)/El Loa, Provinz/Calama/Cerritos Bayos/Alcaparrosa Mine
Mineral: Coquimbite
Image: 1295794164
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Coquimbit

Bildbreite: 4,5 mm, Fundort: Alcaparrosa Mine, Cerritos Bayos, Calama, Provinz Antofagasta, Chile
Collection: Domenico Preite
Copyright: Enrico Bonacina
Contribution: thdun5 2011-01-23
Locality: Alcaparrosa Mine / Cerritos Bayos / Calama / El Loa, Provinz / Antofagasta, Region (II. Region) / Chile
Coquimbit
Views (File:
1271589555
): 1775
Coquimbit
Bildbreite: 0,5 mm, Fundort: Alcaparrosa Mine, Cerritos Bayos, Calama, Provinz Antofagasta, Chile.
Copyright: Luigi Mattei; Contribution: thdun5
Location: Chile/Antofagasta, Region (II. Region)/El Loa, Provinz/Calama/Cerritos Bayos/Alcaparrosa Mine
Mineral: Coquimbite
Image: 1271589555
Rating: 5 (votes: 1)
License: Usage for Mineralienatlas project only
Coquimbit

Bildbreite: 0,5 mm, Fundort: Alcaparrosa Mine, Cerritos Bayos, Calama, Provinz Antofagasta, Chile.
Copyright: Luigi Mattei
Contribution: thdun5 2010-04-18
Locality: Alcaparrosa Mine / Cerritos Bayos / Calama / El Loa, Provinz / Antofagasta, Region (II. Region) / Chile
Coquimbit
Views (File:
1257628615
): 2437
Coquimbit
Größe: 44x29x28 mm; Fundort: Rio Tinto, Huelva, Andalusien, Spanien
Copyright: Rob Lavinsky; Contribution: slugslayer
Location: Spanien/Andalusien (Andalucía)/Huelva, Provinz/Cuenca Minera/Minas de Riotinto
Mineral: Coquimbite
Image: 1257628615
License: Usage for Mineralienatlas project only
Coquimbit

Größe: 44x29x28 mm; Fundort: Rio Tinto, Huelva, Andalusien, Spanien
Copyright: Rob Lavinsky
Contribution: slugslayer 2009-11-07
Locality: Minas de Riotinto / Cuenca Minera / Huelva, Provinz / Andalusien (Andalucía) / Spanien

You find additional Coquimbit specimen at the Geolitho Museum

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2.5
Solubility +++ langsam in H2O, Lagern bei 40-60% realtiver Luftfeuchte oderin einem versiegelten Behälter. Hohe und tiefe Luftfeuchten zerstören das Mineral.
Crystal System trigonal, P31c

Chemism

Chemical formula

AlFe3(SO4)6(H2O)12·6H2O

Chemical composition

Aluminium, Eisen, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 1095.1722902 u; Number of atoms in the formula: 88

Info

Empirical formula:

AlFe3(SO4)6(H2O)12·6H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

3.31

36

40.91

1.0079470

36.2860920
Oxygen

O

61.36

42

47.73

15.9994300

671.9760600
Aluminium

Al

2.46

1

1.14

26.9815382

26.9815382
Sulfur

S

17.57

6

6.82

32.0655000

192.3930000
Iron

Fe

15.30

3

3.41

55.8452000

167.5356000

Analysis wt%

Fe2O3 : 25.84, Al2O3 : 2.25, SO3 : 44.19, H2O : 27.25 (Ref: Dana, 7th ed. 2)

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.08-040

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

Classification by Hölzel

7.CC.211

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

Dana 8th edition

29.08.03.01

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; IMA 19-F: Redefinition von Coquimbit - CNMNC Newsletter 52, 2019

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.009
Birefringence chart\! Coquimbite title=Birefringence chart Coquimbite

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

1.539

RI value γ / ε

1.548

Ri mean

1.542

2V angle

Uniaxial (+)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

163

Space Group

P31c

Cell parameters a (Å)

10.922

Cell parameters b (Å)

-

Cell parameters c (Å)

17.084

Cell parameters a/b or c/a

1.564

Cell parameters c/b

-

Z

2

Volumne (ų)

1764.918

X-Ray Powder Diffraction

9.43(40),
8.26(100),
5.441(50),
4.599(60),
3.633(50),
3.492(30),
3.360(70),
2.753(70)
XRD chart Coquimbite

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 (gemessen)

2.061 ( ρ calc. Mineralienatlas )

Instability

+++ langsam in H2O, Lagern bei 40-60% realtiver Luftfeuchte oderin einem versiegelten Behälter. Hohe und tiefe Luftfeuchten zerstören das Mineral.

(Co-)Type locality

(Co-)Type locality

Chile/Coquimbo, Region (IV. Region)

Type material

Das Neotypiematerial ist das von Fang und Robinson (1970) untersuchte Exemplar aus der Tierra Amarilla (der von Rose, 1833, beschriebenen ursprünglichen Typuslokalität) und wird im U.S. National Museum, Washington DC, USA, Katalognummer 12548 aufbewahrt.

Preface

Author (Name, Year)

Rose, 1833

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 162

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.

Other languages

German

Coquimbit

Spanish

Coquimbita

English

Coquimbite

French

Coquimbite

Russian

Кокимбит

Simplified Chinese

针绿矾

Alternative Name

Blakeite (of Dana)

German

Neutrales schwefelsaures Eisenoxyd

CNMNC symbol

Symbol

Coq

Locations with GPS information