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Tephroite (Tephroit)

Pictures (17 Images total)

Tephroit
Views (File:
1167410642
): 4779
Tephroit
Bilbreite: 3 mm; Fundort: Laacher See-Vulkangebiet, Eifel, Deutschland
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Deutschland/Rheinland-Pfalz/Ahrweiler, Landkreis/Brohltal, Verbandsgem./Laacher See
Mineral: Tephroite
Image: 1167410642
Rating: 9.33 (votes: 3)
License: Usage for Mineralienatlas project only
Tephroit

Bilbreite: 3 mm; Fundort: Laacher See-Vulkangebiet, Eifel, Deutschland

Copyright: Stephan Wolfsried
Contribution: Hg 2006-12-29
Locality: Laacher See / Brohltal, Verbandsgem. / Ahrweiler, Landkreis / Rheinland-Pfalz / Deutschland
Tephroit
Views (File:
1204410688
): 2280
Tephroit
Bildbreite: 3 mm; Fundort: Fundort: Laacher See Vulkangebiet, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Deutschland/Rheinland-Pfalz/Ahrweiler, Landkreis/Brohltal, Verbandsgem./Laacher See
Mineral: Tephroite
Image: 1204410688
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Tephroit

Bildbreite: 3 mm; Fundort: Fundort: Laacher See Vulkangebiet, Eifel, Rheinland-Pfalz, Deutschland

Copyright: Stephan Wolfsried
Contribution: Hg 2008-03-01
Locality: Laacher See / Brohltal, Verbandsgem. / Ahrweiler, Landkreis / Rheinland-Pfalz / Deutschland
Tephroit
Views (File:
1204410759
): 2457
Tephroit
Bildbreite: 6 mm; Fundort: Fundort: Laacher See Vulkangebiet, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Deutschland/Rheinland-Pfalz/Ahrweiler, Landkreis/Brohltal, Verbandsgem./Laacher See
Mineral: Tephroite
Image: 1204410759
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Tephroit

Bildbreite: 6 mm; Fundort: Fundort: Laacher See Vulkangebiet, Eifel, Rheinland-Pfalz, Deutschland

Copyright: Stephan Wolfsried
Contribution: Hg 2008-03-01
Locality: Laacher See / Brohltal, Verbandsgem. / Ahrweiler, Landkreis / Rheinland-Pfalz / Deutschland
Tephroit
Views (File:
1185115644
): 2938
Tephroit
Laacher See-Vulkangebiet, Eifel, Deutschland
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Deutschland/Rheinland-Pfalz/Ahrweiler, Landkreis/Brohltal, Verbandsgem./Laacher See
Mineral: Tephroite
Image: 1185115644
Rating: 8.33 (votes: 3)
License: Usage for Mineralienatlas project only
Tephroit

Laacher See-Vulkangebiet, Eifel, Deutschland

Copyright: Stephan Wolfsried
Contribution: Hg 2007-07-22
Locality: Laacher See / Brohltal, Verbandsgem. / Ahrweiler, Landkreis / Rheinland-Pfalz / Deutschland
Tephroit
Views (File:
1179605456
): 1396, Rating: 7.25
Tephroit
Bildbreite: 1 mm; Fundort: Laacher See-Vulkangebiet, Eifel, Deutschland
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Deutschland/Rheinland-Pfalz/Ahrweiler, Landkreis/Brohltal, Verbandsgem./Laacher See
Mineral: Tephroite
Image: 1179605456
Rating: 7.25 (votes: 4)
License: Usage for Mineralienatlas project only
Tephroit

Bildbreite: 1 mm; Fundort: Laacher See-Vulkangebiet, Eifel, Deutschland

Copyright: Stephan Wolfsried
Contribution: Hg 2007-05-19
Locality: Laacher See / Brohltal, Verbandsgem. / Ahrweiler, Landkreis / Rheinland-Pfalz / Deutschland
Tephroit
Views (File:
1311875990
): 788
Tephroit
Größe: 25x18x17 mm; Fundort: Wessels Mine, Hotazel, Kalahari Manganfelder, Provinz Nordkap, Südafrika
Copyright: Rob Lavinsky; Contribution: slugslayer
Location: Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Hotazel/Wessel's Mine (Wessels Mine)
Mineral: Tephroite
Image: 1311875990
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Tephroit

Größe: 25x18x17 mm; Fundort: Wessels Mine, Hotazel, Kalahari Manganfelder, Provinz Nordkap, Südafrika

Copyright: Rob Lavinsky
Contribution: slugslayer 2011-07-28
Locality: Wessel's Mine (Wessels Mine) / Hotazel / Kalahari Manganese Field / Nordkap (Northern Cape), Provinz / Südafrika

Collectors Summary

Color fleischrot, grau
Streak color grauweiß
Hardness (Mohs) 6
Solubility +++ Säuren
Crystal System orthorhombisch, Pbnm

Chemism

Chemical formula

Mn2SiO4

Chemical composition

Mangan, Silicium, Sauerstoff

Unit weight: 201.9593498 u; Number of atoms in the formula: 7

Info

Empirical formula:

Mn2SiO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

31.69

4

57.14

15.9994300

63.9977200

Silicon

Si

13.91

1

14.29

28.0855300

28.0855300

Manganese

Mn

54.41

2

28.57

54.9380499

109.8760998

Analysis wt%

SiO2 : 29.31, Al2O3 : 0.48, Fe2O3 : 1.21, FeO : 1.67, MnO : 65.32, MgO : 0.71, CaO : 0.70 (Ref: American Mineralogist 59)

Strunz 9th edition incl. updates

9.AC.05

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
C: Insel(Neso)silikate ohne weitere Anionen; Kationen in oktahedraler [6] Koordination
05:Olivin-Gruppe

Lapis Classification

VIII/A.04-030

VIII: SILIKATE
A: Inselsilikate mit [SiO4] 4--Baugruppen
4: Kationen in oktaedrischer Koordination [6]; Olivin-Gruppe

Classification by Hölzel

9.AB.200

9: SILICATES
A: Nesosilicates
B: Olivine-Group

Dana 8th edition

51.03.01.04

51: Nesosilicate Minerals
03: Nesosilicates Nesosilicate Insular SiO4 Groups Only with all cations in octahedral [6] coordination
01: Olivine group

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Olivine group

Optical Properties

Color

fleischrot, grau

Streak color

grauweiß

max. Birefringence

0.04

Birefringence chart\! Tephroite title=Birefringence chart Tephroite

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

1.78

RI value β

1.81

RI value γ / ε

1.82

Ri mean

1.803

2V angle

Biaxial (-) 65°~

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pbnm

Cell parameters a (Å)

4.812

Cell parameters b (Å)

10.556

Cell parameters c (Å)

6.196

Cell parameters a/b or c/a

0.456

Cell parameters c/b

0.587

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

314.729

X-Ray Powder Diffraction

4.044(20),
2.867(100),
2.660(30),
2.611(70),
2.572(90),
2.335(20),
2.200(20),
1.811(30)

XRD chart Tephroite

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)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.11 (gemessen)

4.262 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

Preface

Author (Name, Year)

Breithaupt, 1823

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 785

IMA group assignments

Varieties

Picrotephroite

magnesiumhaltige Tephroit-Varietät

Other languages

Spanish

Tefroita

German

Tephroit

English

Tephroite

French

Tephroite

Russian

Тефроит

Traditional Chinese

錳橄欖石

Simplified Chinese

锰橄榄石

Alternative Name

Mangan-Peridot

Spanish

Tephroita

CNMNC symbol

Symbol

Tep

Locations with GPS information