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Hohmannite

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Hohmannit
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Hohmannit

Quetena Mine,Chuquicamata/Antofagasata,Chile; Bildbreite ca.7 mm

Collection: Haubi
Copyright: Haubi
Contribution: Haubi 2018-01-03
Locality: Queténa Mine / Chuquicamata District / Calama / Antofagasta, Provinz / Antofagasta, Region (II. Region) / Chile

Collectors Summary

Color braun, orange braun, rötlichbraun
Streak color orange
Hardness (Mohs) 3
Solubility +++ HCl, heißes H2O, +- kaltes H2O, dehydr. zu Metahohmannit
Crystal System triklin, P1

Chemism

Chem­ical formula

Fe23+(SO4)2(OH)2·7H2O

Chem­ical com­po­si­tion

Eisen, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 463.938862 u; Number of atoms in the formula: 37

Info

Empirical formula:

Fe2(SO4)2(OH)2·7H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

3.48

16

43.24

1.0079470

16.1271520

Oxygen

O

58.63

17

45.95

15.9994300

271.9903100

Sulfur

S

13.82

2

5.41

32.0655000

64.1310000

Iron

Fe

24.07

2

5.41

55.8452000

111.6904000

Anal­y­sis wt%

Fe2O3 : 34.42, SO3 : 34.51, H2O : 31.07 (Ref: berechnet)

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.01-050

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

Clas­sifica­tion by Hölzel

7.DE.350

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

Dana 8th edi­tion

31.09.04.01

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

braun, orange braun, rötlichbraun

Streak color

orange

Diaphane­ity (Trans­parency)

transparent bis durchscheinend

max. Birefrin­gence

0.096

Birefringence chart\! Hohmannite title=Birefringence chart Hohmannite

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

1.559

RI value β

1.643

RI value γ / ε

1.655

Ri mean

1.619

2V angle

Biaxial (-) 40°

Optical Data Luminescence

Lumi­nes­cence

keine Fluoreszenz bekannt

Crystallography

Crystal Sys­tem

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell param­e­ters a (Å)

9.05

Cell param­e­ters b (Å)

10.88

Cell param­e­ters c (Å)

7.17

Cell param­e­ters a/b or c/a

0.832

Cell param­e­ters c/b

0.659

Cell param­e­ters α

90.15

Cell param­e­ters β

90.58

Cell param­e­ters γ

106.97

Z

2

Volumne (ų)

675.201

Kristall struc­ture

G. Ventruti, G. Della Ventura, R. Orlando, F. Scordari: Structure refinement, hydrogen-bond system and vibrational spectroscopy of hohmannite, [O(SO 4)2]•8H2O. Mineralogical Magazine Vol. 79, Issue 1 (2015) S. 11-24.

X-Ray Pow­der Diffrac­tion

10.36(80),
8.69(90),
7.92(100),
5.31(70),
3.95(40),
3.46(80),
3.26(40),
3.12(70)

XRD chart Hohmannite

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

VHN (Hard­ness Vick­ers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.2

2.282 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ HCl, heißes H2O, +- kaltes H2O, dehydr. zu Metahohmannit

(Co-)Type locality

(Co-)Type locality

Chile/Antofagasta, Region (II. Region)/Tocopilla, Provinz/Sierra Gorda District

Type mate­r­ial

Mineralogische Sammlung der TU Bergakademie Freiberg

Col­lec­tion number of type mate­r­ial

18623 / a 8,6

Par­a­ge­n­e­sis of type mate­r­ial

Copiapit, Amarantit, Botryogen

Preface

Author (Name, Year)

Frenzel, 1888

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 291

Mineralogische und petrographische Mitteilungen 9 (1887), 397

Mineralogical Magazine 79 (2015), 11

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

Other languages

German

Hohmannit

Spanish

Hohmannita

French

Hohmannite

English

Hohmannite

Russian

Хохманнит

Alternative Name

Castanite

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

German pages

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

English pages

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

Webmineral.ru - search for: Хохманнит

Mineral Dealer

German pages

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Locations with GPS information