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Metahohmannite

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Metahohmannit neben Copiapit
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Metahohmannit neben Copiapit

orangerote Krusten aus faserigen Metahohmannit neben gelbgrünen Krusten von Copiapit, Alcaparrosa Mine, Cerritos Bayos, Antofagasta Region, Chile; BB 10 cm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-04-06
Locality: Alcaparrosa Mine / Cerritos Bayos / Calama / Antofagasta, Provinz / Antofagasta, Region (II. Region) / Chile

Collectors Summary

Color orange
Streak color blassgelb
Solubility +++ Säuren
Crystal System triklin, P1

Chemism

Chem­ical formula

Fe23+(SO4)2(OH)2·3H2O

Chem­ical com­po­si­tion

Eisen, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 391.877566 u; Number of atoms in the formula: 25

Info

Empirical formula:

Fe2(SO4)2(OH)2·3H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.06

8

32.00

1.0079470

8.0635760

Oxygen

O

53.08

13

52.00

15.9994300

207.9925900

Sulfur

S

16.37

2

8.00

32.0655000

64.1310000

Iron

Fe

28.50

2

8.00

55.8452000

111.6904000

Anal­y­sis wt%

Fe2O3 : 39.25, SO3 : 39.61, H2O : 20.29 (Ref: Bulletin de Mineralogie 35)

Strunz 9th edi­tion incl. updates

7.DB.30

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
D: Sulfate (Selenate, etc.) mit weitere Anionen, mit H2O
B: mit mittelgroßen Kationen; isolierte Oktaeder und begrenzte Einheiten
30:Amarantit-Gruppe

Lapis Clas­sifica­tion

VI/D.01-035

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
D: Wasserhaltige Sulfate, mit fremden Anionen
1: Mittelgroße Kationen

Clas­sifica­tion by Hölzel

7.DE.310

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
D: Sulfates (+Anions +Water)
E: Aluminite-Group

Dana 8th edi­tion

31.09.05.01

31: Hydrated Sulfates Containing Hydroxyl or Halogen
09: Hydrated Sulfates Containing Hydroxyl or Halogen where (A+ B++) (XO4) Zq·x(H2O)

IMA sta­tus

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

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

orange

Streak color

blassgelb

max. Birefrin­gence

0.025

Birefringence chart\! Metahohmannite title=Birefringence chart Metahohmannite

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

1.709

RI value β

1.718

RI value γ / ε

1.734

Ri mean

1.720

2V angle

Biaxial (+) 70°~

Crystallography

Crystal Sys­tem

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell param­e­ters a (Å)

7.348

Cell param­e­ters b (Å)

9.771

Cell param­e­ters c (Å)

7.152

Cell param­e­ters a/b or c/a

0.752

Cell param­e­ters c/b

0.732

Cell param­e­ters α

91.68

Cell param­e­ters β

98.52

Cell param­e­ters γ

86.38

Z

2

Volumne (ų)

506.711

X-Ray Pow­der Diffrac­tion

9.7(60),
7.18(100),
7.04(60),
4.27(70),
3.28(70),
2.96(70),
2.70(70),
2.49(70)

XRD chart Metahohmannite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.568 (berechnet)

2.568 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ Säuren

Preface

Author (Name, Year)

Bandy, 1938

References

American Mineralogist 89 (2004), 265

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

Amarantite

Fe3+2O(SO4)2(H2O)4·3H2O

triklin : 1 : P1

7.DB.30

Hohmannite

Fe23+(SO4)2(OH)2·7H2O

triklin : 1 : P1

7.DB.30

Metahohmannite

Fe23+(SO4)2(OH)2·3H2O

triklin : 1 : P1

7.DB.30

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

Butlerite

Fe3+(SO4)(OH)·2H2O

monoklin : 2/m : P21/m

VI/D.01-020

Parabutlerite

Fe3+(SO4)(OH)·2H2O

orthorhombisch : mmm : Pmnb

VI/D.01-030

Volaschioite

Fe4(SO4)O2(OH)6·2H2O

monoklin : 2/m : C2/m

VI/D.01-032

Metahohmannite

Fe23+(SO4)2(OH)2·3H2O

triklin : 1 : P1

VI/D.01-035

Amarantite

Fe3+2O(SO4)2(H2O)4·3H2O

triklin : 1 : P1

VI/D.01-040

Hohmannite

Fe23+(SO4)2(OH)2·7H2O

triklin : 1 : P1

VI/D.01-050

Fibroferrite

Fe3+(SO4)(OH)·5H2O

trigonal : 3 : R3

VI/D.01-060

Xitieshanite

Fe3+(SO4)Cl·6H2O

monoklin : 2/m : P21/a

VI/D.01-070

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

Metahohmannite

Fe23+(SO4)2(OH)2·3H2O

triklin : 1 : P1

7.DE.310

Amarantite

Fe3+2O(SO4)2(H2O)4·3H2O

triklin : 1 : P1

7.DE.340

Hohmannite

Fe23+(SO4)2(OH)2·7H2O

triklin : 1 : P1

7.DE.350

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

Butlerite

Fe3+(SO4)(OH)·2H2O

monoklin : 2/m : P21/m

31.09.01.01

Parabutlerite

Fe3+(SO4)(OH)·2H2O

orthorhombisch : mmm : Pmnb

31.09.02.01

Amarantite

Fe3+2O(SO4)2(H2O)4·3H2O

triklin : 1 : P1

31.09.03.01

Hohmannite

Fe23+(SO4)2(OH)2·7H2O

triklin : 1 : P1

31.09.04.01

Metahohmannite

Fe23+(SO4)2(OH)2·3H2O

triklin : 1 : P1

31.09.05.01

Botryogen

MgFe3+(SO4)2(OH)·7H2O

monoklin : 2/m : P21/n

31.09.06.01

Zincobotryogen

ZnFe3+(SO4)2(OH)·7H2O

monoklin : 2/m : P21/n

31.09.06.02

Xitieshanite

Fe3+(SO4)Cl·6H2O

monoklin : 2/m : P21/a

31.09.06.03

Guildite

CuFe3+(SO4)2(OH)·4H2O

monoklin : 2/m : P21/m

31.09.07.01

Chaidamuite

(Zn,Fe2+)Fe3+OH(SO4)2·4H2O

triklin : 1 : P1

31.09.07.02

Aubertite

CuAl(SO4)2Cl·14H2O

triklin : 1 : P1

31.09.08.01

Svyazhinite

(Mg,Mn)(Al,Fe3+)(SO4)2F·14 H2O

triklin : 1, 1 : P1, P1

31.09.08.02

Magnesioaubertite

(Mg,Cu)Al(SO4)2Cl·14 H2O

triklin : P1 : 1

31.09.08.03

Wilcoxite

MgAl(SO4)2F·18H2O

triklin : 1, 1 : P1, P1

31.09.09.01

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

German pages

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

English pages

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

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Mineral Dealer

German pages

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Locations with GPS information