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Jacobsite

Pictures (14 Images total)

Jakobsit, N'Chwaning II, Südafrika, Tucson 2014
Views (File:
1394430550
): 2528
Jakobsit, N'Chwaning II, Südafrika, Tucson 2014
Jakobsit, 3 cm, aus N'Chwaning II Mine, Kalahari, Südafrika, im Angebot im InnSuites Hotel, Tucson 2014
Copyright: Manganit; Contribution: Manganit
Collection: Southern African Minerals
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)
Mineral: Jacobsite
Image: 1394430550
Rating: 10 (votes: 1)
License: Usage for Mineralienatlas project only
Jakobsit, N'Chwaning II, Südafrika, Tucson 2014

Jakobsit, 3 cm, aus N'Chwaning II Mine, Kalahari, Südafrika, im Angebot im InnSuites Hotel, Tucson 2014

Collection: Southern African Minerals
Copyright: Manganit
Contribution: Manganit 2014-03-10
Locality: N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Jakobsit
Views (File:
1180282827
): 3382, Rating: 5.75
Jakobsit
FO: Schweden/Värmland/Filipstad/Nordmark/Jakobsberg; Bildausschnitt 10 x 7 mm
Copyright: rtbstone; Contribution: rtbstone
Collection: rtbstone
Location: Schweden/Värmland, Provinz/Filipstad, Gemeinde/Nordmark (Nordmarksberg)/Jakobsberg
Mineral: Jacobsite
Image: 1180282827
Rating: 5.75 (votes: 4)
License: Usage for Mineralienatlas project only
Jakobsit

FO: Schweden/Värmland/Filipstad/Nordmark/Jakobsberg; Bildausschnitt 10 x 7 mm

Collection: rtbstone
Copyright: rtbstone
Contribution: rtbstone 2007-05-27
Locality: Jakobsberg / Nordmark (Nordmarksberg) / Filipstad, Gemeinde / Värmland, Provinz / Schweden
Jakobsit
Views (File:
1257637069
): 2681
Jakobsit
Bildbreite: 5 mm; Fundort: Iron Monarch Opencut, Halbinsel Eyre, Süd-Australien
Copyright: Alan Goldstein; Contribution: Philip Blümner
Location: Australien/South Australia/Eyre Peninsula/Middleback Range/Iron Knob/Iron Monarch Opencut
Mineral: Jacobsite
Image: 1257637069
Rating: 5 (votes: 1)
License: Usage for Mineralienatlas project only
Jakobsit

Bildbreite: 5 mm; Fundort: Iron Monarch Opencut, Halbinsel Eyre, Süd-Australien

Copyright: Alan Goldstein
Contribution: Philip Blümner 2009-11-07
Locality: Iron Monarch Opencut / Iron Knob / Middleback Range / Eyre Peninsula / South Australia / Australien
Jakobsit
Views (File:
1217077455
): 2675
Jakobsit
In Matrix. Jakobsberg, Nordmark, Filistad, Värmland, Schweden. 5x6cm.
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Doc Diether
Location: Schweden/Värmland, Provinz/Filipstad, Gemeinde/Nordmark (Nordmarksberg)/Jakobsberg
Mineral: Jacobsite
Image: 1217077455
Rating: 3.5 (votes: 2)
License: Usage for Mineralienatlas project only
Jakobsit

In Matrix. Jakobsberg, Nordmark, Filistad, Värmland, Schweden. 5x6cm.

Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2008-07-26
Locality: Jakobsberg / Nordmark (Nordmarksberg) / Filipstad, Gemeinde / Värmland, Provinz / Schweden
Jakobsit
Views (File:
1180283655
): 2744
Jakobsit
Größe: 3,8 x 3,5 x 3,2 cm; Fundort: N'Chwaning Mine - Kalahari Cape Provinz - Südafrika
Copyright: Rob Lavinsky; Contribution: Hg
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)
Mineral: Jacobsite
Image: 1180283655
License: Usage for Mineralienatlas project only
Jakobsit

Größe: 3,8 x 3,5 x 3,2 cm; Fundort: N'Chwaning Mine - Kalahari Cape Provinz - Südafrika

Copyright: Rob Lavinsky
Contribution: Hg 2007-05-27
Locality: N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika

You find additional specimen at the Geolitho Museum

Collectors Summary

Color graulich mit mit oliven Farbton und braun internen Reflektionen
Streak color rötlich schwarz
Hardness (Mohs) 6
Solubility ++ HCl
Crystal System kubisch, Fd3m

Chemism

Chemical formula

(Mn2+,Fe2+,Mg)(Fe3+,Mn3+)2O4

Chemical composition

Eisen, Magnesium, Mangan, Sauerstoff

Unit weight: 227.38144089 u; Number of atoms in the formula: 7

Info

Empirical formula:

(Mn0.6Fe0.3Mg0.1)(Fe0.75Mn0.25)2O4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

28.15

4

57.14

15.9994300

63.9977200

Magnesium

Mg

1.07

0.1

1.43

24.3050600

2.4305060

Manganese

Mn

26.58

1.1

15.71

54.9380499

60.4318549

Iron

Fe

44.21

1.8

25.71

55.8452000

100.5213600

Analysis wt%

MgO : 9.26, FeO : 2.57, MnO : 13.94, Fe2O3 : 73.96 (Ref: Dana, 7th ed. 1)

Strunz 9th edition incl. updates

4.BB.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
B: Metall: Sauerstoff = 3:4 und vergleichbare
B: Mit ausschließlich mittelgroßen [Kationen]
05:Spinel-Gruppe

Lapis Classification

IV/B.02-030

IV: OXIDE
B: Oxide mit Verhältnis Metall zu Sauerstoff = 3:4 (Spinelltyp M3O4 und verwandte Verbindungen)
2: Spinell-Gruppe; Ferrit-Spinelle

Classification by Hölzel

4.BB.170

4: OXIDES
B: Spinels R3O4
B: Fe-Spinels

Dana 8th edition

07.02.02.02

07: Multiple Oxides
02: Multiple Oxides (A+ B++)2 X4 Spinel group
02: (Iron subgroup)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Spinel supergroup  ⇒ Oxyspinel group  ⇒ Spinel subgroup

Optical Properties

Color

graulich mit mit oliven Farbton und braun internen Reflektionen

Streak color

rötlich schwarz

Diaphaneity (Transparency)

opak

RI value α / ω / n

2.3

Ri mean

2.3

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

8.47

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volume (ų)

607.645

X-Ray Powder Diffraction

4.906(20),
3.005(30),
2.563(100),
2.124(20),
1.734(20),
1.635(30),
1.503(40),
1.106(30)

XRD chart Jacobsite

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)

6

VHN (Hardness Vickers)

746 (100g)

Density (g/cm³)

4.75

4.971 ( ρ calc. Mineralienatlas )

Instability

++ HCl

Preface

Occurrences

Jakobsberg/Nordmark/Filpstad/Värmland/Schweden
Metamorphisierte sedimentäre Mn-Lagerstätten.

Associations

u.a. Hausmannit.

Author (Name, Year)

Damour, 1869

Additional Information

Stark ferrimagnetisch (Rösler, 1988).

References

Handbook of Mineralogy (Anthony et al.), 3 (1997), 274

Rösler, H.J. (1988), Lehrbuch der Mineralogie, Deutscher Verlag für Grundstoffindustrie; 4. Aufl. Edition, 844 Seiten, S. 409, ISBN: 978-3-34200-288-8.

IMA group assignments


 
 
 
 
 

 
 
 
 
 
 

 
 
 
 
Fe2+Cr2O4
kubisch
Fd3m

 
 
 
 
(Co,Ni,Fe2+)(Cr,Al)2O4
kubisch
Fd3m

 
 
 
 
Fe2+V23+O4
kubisch
Fd3m

 
 
 
 
(Cu,Mg)Fe23+O4
kubisch
Fd3m

 
 
 
 
V2+Al2O4
kubisch
Fd3m

 
 
 
 
Al2O3
tetragonal
P4m2

 
 
 
 
(Zn,Mn2+,Fe2+)(Fe3+,Mn3+)2O4
kubisch
Fd3m

 
 
 
 
ZnAl2O4
kubisch
Fd3m

 
 
 
 
(Mn,Fe2+,Mg)(Al,Fe3+)2O4
kubisch
Fd3m

 
 
 
 
Co2+Co3+2O4
kubisch
Fd3m

 
 
 
 
Mn2+Mn23+O4
tetragonal
I41/amd

 
 
 
 
Fe2+Al2O4
kubisch
Fd3m

 
 
 
 
ZnMn23+O4
tetragonal
I41/amd

 
 
 
 
(Mn2+,Fe2+,Mg)(Fe3+,Mn3+)2O4
kubisch
Fd3m

 
 
 
 
Fe2.67O4
kubisch
P4132, P4332

 
 
 
 
MgCr2O4
kubisch
Fd3m

 
 
 
 
MgV23+O4
kubisch
Fd3m

 
 
 
 
MgFe23+O4
kubisch
Fd3m

 
 
 
 
Fe2+Fe23+O4
kubisch
Fd3m

 
 
 
 
(Mn,Fe2+)(Cr,V)2O4
kubisch
Fd3m

 
 
 
 
MgAl2O4
kubisch
Fd3m

 
 
 
 
CuAl2O4
kubisch
Fd3m

 
 
 
 
Fe3+(Fe3+,Ti4+,Fe2+,☐)2O4
kubisch
P4332, P4132

 
 
 
 
NiFe23+O4
kubisch
Fd3m

 
 
 
 
(Mn2+,Fe2+)(V3+,Cr3+)2O4
kubisch
Fd3m

 
 
 
 
ZnCr2O4
kubisch
Fd3m

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Actuality: 05. Nov 2024 - 18:28:59

Other languages

Spanish

Jacobsita

French

Jacobsite

English

Jacobsite

German

Jakobsit

Russian

Якобсит

Simplified Chinese

黑镁铁锰矿

Japanese

ヤコブス鉱

Alternative Name

German

Jacobsit

English

Magnetostibian

English

Manganoferrite

English

Manganspinel

Simplified Chinese

锰铁矿

CNMNC symbol

Symbol

Jcb

Locations with GPS information

IDs

GUSID (Global unique identifier short form) y_gRfzE_Ck292YABFK2qnQ
GUID (Global unique identifier) 7F11F8CB-3F31-4D0A-BDD9-800114ADAA9D
Database ID 1767