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Sturmanite (Sturmanit)

Pictures (50 Images total)

Brucit und Sturmanit
Views (File:
1730154781
): 99
Brucit und Sturmanit
farbloser Brucit als kugeliges Aggregat mit gelben Sturmanitkristallen. N'Chwaning Mines, Kalahari, Südafrika. BB: 6,5mm
Copyright: Mabu; Contribution: Mabu
Collection: Mabu
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)
Mineral: Brucite, Sturmanite
Image: 1730154781
Rating: 9.5 (votes: 2)
License: Usage for Mineralienatlas project only
Brucit und Sturmanit

farbloser Brucit als kugeliges Aggregat mit gelben Sturmanitkristallen. N'Chwaning Mines, Kalahari, Südafrika. BB: 6,5mm
Collection: Mabu
Copyright: Mabu
Contribution: Mabu 2024-10-28
Locality: N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Sturmanit xx
Views (File:
1103050705
): 2912, Rating: 8.8
Sturmanit xx
Bildbreite 4 cm; Fundort: N'Chwaning II Mine, Kalahari (Manganfelder), Südafrika
Copyright: berthold; Contribution: Mineralienatlas
Collection: berthold
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)/N'Chwaning II Mine
Mineral: Sturmanite
Image: 1103050705
Rating: 8.8 (votes: 5)
License: Usage for Mineralienatlas project only
Sturmanit xx

Bildbreite 4 cm; Fundort: N'Chwaning II Mine, Kalahari (Manganfelder), Südafrika
Collection: berthold
Copyright: berthold
Contribution: Mineralienatlas 2004-12-14
Locality: N'Chwaning II Mine / N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Sturmanite
Views (File:
1511758132
): 1332
Sturmanite
Perfect quality, Sturmanite specimen, from N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa; Size 60 х 29 х 23 mm
Copyright: pegmatite; Contribution: pegmatite
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)
Mineral: Sturmanite
Image: 1511758132
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Sturmanite

Perfect quality, Sturmanite specimen, from N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa; Size 60 х 29 х 23 mm
Copyright: pegmatite
Contribution: pegmatite 2017-11-27
Locality: N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Sturmanit
Views (File:
1266740903
): 2918, Rating: 8.44
Sturmanit
N'Chwaning II Mine, Kalahari Manganese Field, Südafrika, 32x26 mm
Copyright: Embarak; Contribution: Embarak
Collection: Embarak
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)/N'Chwaning II Mine
Mineral: Sturmanite
Image: 1266740903
Rating: 8.44 (votes: 9)
License: Usage for Mineralienatlas project only
Sturmanit

N'Chwaning II Mine, Kalahari Manganese Field, Südafrika, 32x26 mm
Collection: Embarak
Copyright: Embarak
Contribution: Embarak 2010-02-21
Locality: N'Chwaning II Mine / N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Sturmanit
Views (File:
1361713623
): 1924, Rating: 7.75
Sturmanit
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa. Stufenbreite 1,8 cm
Copyright: skibbo; Contribution: skibbo
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)
Mineral: Sturmanite
Image: 1361713623
Rating: 7.75 (votes: 8)
License: Usage for Mineralienatlas project only
Sturmanit

N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa. Stufenbreite 1,8 cm
Copyright: skibbo
Contribution: skibbo 2013-02-24
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 grünlichgelb, gelb, gelbgrün, orange braun
Streak color gelb weiß
Hardness (Mohs) 2.5
Solubility +++ HCl
Crystal System trigonal, P31c

Chemism

Chemical formula

Ca6(Fe3+,Al,Mn2+)2(SO4)2[B(OH)4](OH)12·25H2O

Chemical composition

Aluminium, Calcium, Eisen, Mangan, Bor, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 1260.1004449 u; Number of atoms in the formula: 126

Info

Empirical formula:

Ca6(Fe0.6Al0.3Mn0.1)2(SO4)2[B(OH)4](OH)12·25H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

5.28

66

52.38

1.0079470

66.5245020
Boron

B

0.86

1

0.79

10.8117000

10.8117000
Oxygen

O

62.22

49

38.89

15.9994300

783.9720700
Aluminium

Al

1.28

0.6

0.48

26.9815382

16.1889229
Sulfur

S

5.09

2

1.59

32.0655000

64.1310000
Calcium

Ca

19.08

6

4.76

40.0784000

240.4704000
Manganese

Mn

0.87

0.2

0.16

54.9380499

10.9876100
Iron

Fe

5.32

1.2

0.95

55.8452000

67.0142400

Analysis wt%

CaO : 25.60, Fe2O3 : 8.84, Al2O3 : 1.13, MnO : 1.30, B2O3 : 3.20, SO3 : 14.20, H2O : 46.70 (Ref: Canadian Mineralogist 83)

Strunz 9th edition incl. updates

7.DG.15

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
D: Sulfate (Selenate, etc.) mit weitere Anionen, mit H2O
G: Mit großen bis mittelgroßen Kationen; mit NO3, CO3, B(OH)4, SiO4 oder IO3
15:Ettringit-Gruppe

Lapis Classification

VI/D.13-050

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
D: Wasserhaltige Sulfate, mit fremden Anionen
13: Mittelgroße und sehr große Kationen; Ettringit-Gruppe

Classification by Hölzel

7.DK.150

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
D: Sulfates (+Anions +Water)
K: Ettringite-Group

Dana 8th edition

32.04.04.02

32: Compound Sulfates
04: Compound Sulfates (hydrous) with poly-anionic formula
04: Charlesite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Ettringite group

Optical Properties

Color

grünlichgelb, gelb, gelbgrün, orange braun

Streak color

gelb weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.005
Birefringence chart\! Sturmanite title=Birefringence chart Sturmanite

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

1.500

RI value γ / ε

1.505

Ri mean

1.502

2V angle

Uniaxial (+)

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

159

Space Group

P31c

Cell parameters a (Å)

11.16

Cell parameters b (Å)

-

Cell parameters c (Å)

21.79

Cell parameters a/b or c/a

1.953

Cell parameters c/b

-

Z

2

Volume (ų)

2350.262

X-Ray Powder Diffraction

9.67(100),
5.58(70),
4.75(20),
3.89(70),
2.774(50),
2.582(60),
2.215(50),
2.161(40)
XRD chart Sturmanite

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)

1.847

1.781 ( ρ calc. Mineralienatlas )

Instability

+++ HCl

(Co-)Type locality

(Co-)Type locality

Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Black Rock Mine

Preface

Author (Name, Year)

Peacor & Dunn & Duggan, 1983

References

Canadian Mineralogist 21 (1983), 705

IMA group assignments

Other languages

German

Sturmanit

Spanish

Sturmanita

English

Sturmanite

French

Sturmanite

Russian

Стурманит

Japanese

スタルマナイト

CNMNC (IMA)-Number

IMA 1981-011

CNMNC symbol

Symbol

Strm

Locations with GPS information

IDs

GUSID (Global unique identifier short form) M7yfGOqZNU2U3gebs3Hd5Q
GUID (Global unique identifier) 189FBC33-99EA-4D35-94DE-079BB371DDE5
Database ID 3682