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Olmiite (Olmiit)

Pictures (48 Images total)

Olmiit mit Oyelite und Calcit
Views (File:
1350844762
): 3595, Rating: 9.18
Olmiit mit Oyelite und Calcit
Funort: Kalahari Manganese Field, Northern Cape, Südafrika; Größe 5,3 x 3,1 x 2,6 cm
Copyright: jayjay; Contribution: jayjay
Collection: jayjay
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field
Mineral: Olmiite
Image: 1350844762
Rating: 9.18 (votes: 11)
License: Usage for Mineralienatlas project only
Olmiit mit Oyelite und Calcit

Funort: Kalahari Manganese Field, Northern Cape, Südafrika; Größe 5,3 x 3,1 x 2,6 cm
Collection: jayjay
Copyright: jayjay
Contribution: jayjay 2012-10-21
Locality: Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Olmiit auf Calcit
Views (File:
1259432534
): 1531
Olmiit auf Calcit
Größe: 16,3 x 12,8 x 6,1 cm; Fundort: N'Chwaning Mine, Kalahari-Manganfeld, Provinz Nordkap, Südafrika
Copyright: Rob Lavinsky; Contribution: slugslayer
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)
Mineral: Olmiite
Image: 1259432534
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Olmiit auf Calcit

Größe: 16,3 x 12,8 x 6,1 cm; Fundort: N'Chwaning Mine, Kalahari-Manganfeld, Provinz Nordkap, Südafrika
Copyright: Rob Lavinsky
Contribution: slugslayer 2009-11-28
Locality: N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Olmiite and Calcite
Views (File:
1552837782
): 706
Olmiite and Calcite
Olmiite and Calcite crystals on matrix rock, specimen from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa; Dimensions: 53 mm x 46 mm x 30 mm
Copyright: pegmatite; Contribution: pegmatite
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)/N'Chwaning II Mine
Mineral: Olmiite
Image: 1552837782
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Olmiite and Calcite

Olmiite and Calcite crystals on matrix rock, specimen from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa; Dimensions: 53 mm x 46 mm x...
Copyright: pegmatite
Contribution: pegmatite 2019-03-17
Locality: N'Chwaning II Mine / N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Olmiit
Views (File:
1361713583
): 1817, Rating: 8
Olmiit
N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa. Stufenbreite 5,5 cm
Copyright: skibbo; Contribution: skibbo
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)
Mineral: Olmiite
Image: 1361713583
Rating: 8 (votes: 6)
License: Usage for Mineralienatlas project only
Olmiit

N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa. Stufenbreite 5,5 cm
Copyright: skibbo
Contribution: skibbo 2013-02-24
Locality: N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Olmiit
Views (File:
1259430679
): 1631, Rating: 8.4
Olmiit
Größe: 34x18x12 mm; Fundort: N'Chwaning Mine, Kalahari-Manganfeld, Provinz Nordkap, Südafrika
Copyright: Rob Lavinsky; Contribution: slugslayer
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)
Mineral: Olmiite
Image: 1259430679
Rating: 8.4 (votes: 5)
License: Usage for Mineralienatlas project only
Olmiit

Größe: 34x18x12 mm; Fundort: N'Chwaning Mine, Kalahari-Manganfeld, Provinz Nordkap, Südafrika
Copyright: Rob Lavinsky
Contribution: slugslayer 2009-11-28
Locality: N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Olmiit
Views (File:
1259432110
): 524
Olmiit
Größe: 73x64x44 mm; Fundort: N'Chwaning Mine, Kalahari-Manganfeld, Provinz Nordkap, Südafrika
Copyright: Rob Lavinsky; Contribution: slugslayer
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)
Mineral: Olmiite
Image: 1259432110
Rating: 7.5 (votes: 2)
License: Usage for Mineralienatlas project only
Olmiit

Größe: 73x64x44 mm; Fundort: N'Chwaning Mine, Kalahari-Manganfeld, Provinz Nordkap, Südafrika
Copyright: Rob Lavinsky
Contribution: slugslayer 2009-11-28
Locality: N'Chwaning Mines (NChwaning Mines) / Kuruman / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika

You find additional Olmiit specimen at the Geolitho Museum

Collectors Summary

Color beige, orange bis intensiv rötlich
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5 - 5.5
Cleavages keine
Fracture unregelmäßig
Crystal System orthorhombisch, Pbca

Chemism

Chemical formula

CaMn[SiO3(OH)](OH)

Additional chem. information

Mn-dominierendes Analog von Poldervaartit

Chemical composition

Calcium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 205.1150239 u; Number of atoms in the formula: 10

Info

Empirical formula:

CaMn[SiO3(OH)](OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.98

2

20.00

1.0079470

2.0158940
Oxygen

O

39.00

5

50.00

15.9994300

79.9971500
Silicon

Si

13.69

1

10.00

28.0855300

28.0855300
Calcium

Ca

19.54

1

10.00

40.0784000

40.0784000
Manganese

Mn

26.78

1

10.00

54.9380499

54.9380499

Analysis wt%

SiO2 : 29.21, MnO : 29.37, CaO : 31.14, H2O : 8.87 (Ref: Mineralogical Magazine 2007)

Strunz 9th edition incl. updates

9.AF.90

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
F: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in [4], [5] und/oder nur [6] Koordination
90:Poldervaartit-Gruppe

Lapis Classification

VIII/B.22-020

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
22: Kationen mit Koordinationszahlen zwischen [8] und [12]

Classification by Hölzel

9.AI.605

9: SILICATES
A: Nesosilicates
I: Nesosilicates with OH
6: C large; Bultfonteinite-Group

IMA status

anerkannt 09/2006

Mineral status

anerkanntes Mineral

Optical Properties

Color

beige, orange bis intensiv rötlich

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.031
Birefringence chart\! Olmiite title=Birefringence chart Olmiite

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

1.663

RI value β

1.672

RI value γ / ε

1.694

Ri mean

1.676

2V angle

Biaxial (+) 72°

Optical Data Luminescence

Luminescence

tiefrot in kurzwelligem UV Licht

Color LW-UV (365nm)

  

rot

LW-UV Intensity

schwach

Color SW-UV (254nm)

  

rot

SW-UV Intensity

mittel

LW-UV Other Colors

  

violettrot

SW-UV Other Colors

  

violettrot

Most Common Activator

Mn2+

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

61

Space Group

Pbca

Cell parameters a (Å)

9.249

Cell parameters b (Å)

9.076

Cell parameters c (Å)

10.342

Cell parameters a/b or c/a

1.019

Cell parameters c/b

1.139

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volumne (ų)

868.148

X-Ray Powder Diffraction

4.14(60), 4.10(30), 3.19(100), 2.807(35), 2.762(30), 2.545(35), 2.521(30), 2.361(40)
XRD chart Olmiite

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)

5 - 5.5

VHN (Hardness Vickers)

470

Density (g/cm³)

3.102

3.138 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

unregelmäßig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)/N'Chwaning II Mine

Preface

Generation conditions

Bildet sich als Produkt hydrothermaler Umwandlung von Manganerzen.

Associations

Coelestin, Bultfonteinit, Poldervaartit, Sturmanit, Hämatit

Name from

Filippo Olmi (CNR-Institut für Geowissenschaften und Georessourcen Florenz, Italien)

Author (Name, Year)

Bonazzi, P., Bindi, L., Medenbach, O., Pagano, R., Lampronti, Menchett

References

Mineralien Welt 05/08, Steffen Jahn, Die neuen Mineralien 2007 - 2008

Mineralogical Magazine 71 (2007), 193

Other languages

German

Olmiit

English

Olmiite

CNMNC (IMA)-Number

IMA 2006-026

CNMNC symbol

Symbol

Olm

Locations with GPS information