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Olmiite

Pictures (47 Images total)

Olmiit mit Oyelite und Calcit
Views (Image: 1350844762): 3545, 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

Collection: jayjay
Copyright: jayjay
Contribution: jayjay 2012-10-21
Locality: Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika
Olmiit auf Calcit
Views (Image: 1259432534): 1505
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 (Image: 1552837782): 678
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 (Image: 1361713583): 1799, Rating: 8
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 (Image: 1259430679): 1606, Rating: 8.4
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 (Image: 1259432110): 489
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

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

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

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

German pages

DeWikiPedia - search for: Olmiit
Google-Bilder-Suche - search for: Olmiit
Mineralienatlas.de (Forum) - search for: Olmiit

English pages

Mindat - search for: Olmiite
Webmineral - search for:Olmiite
Handbook-of-Mineralogy - search for: Olmiite
RRUFF - Raman, XRD and other mineral data - search for: Olmiite
RRUFF - References and PDF downloads - search for: Olmiite
American-Mineralogist-Crystal-Structure-Database - search for: Olmiite
Strahlen.org - search for: Olmiite

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Olmiit
Crystal-Treasure.com - search for: Olmiit
Bosse - search for: Olmiit
Edelsteine Neuburg - Gundolf Fischer - search for: Olmiit

Locations with GPS information