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Tephroite (Tephroit)

Pictures (17 Images total)

Tephroit
Views (Image: 1167410642): 4713
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 (Image: 1204410688): 2234
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 (Image: 1204410759): 2401
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 (Image: 1185115644): 2865
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 (Image: 1179605456): 1353, Rating: 7.25
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 (Image: 1311875990): 758
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

(Co-)Type locality

(Co-)Type locality

USA/New Jersey/Sussex Co./Franklin Mining District/Ogdensburg/Sterling Hill/Sterling Mine

Preface

Author (Name, Year)

Breithaupt, 1823

References

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

IMA group assignments

 
Olivine group
Mg1.6Fe2+0.4(SiO4)
orthorhombisch
 

 
 
Calcio-olivine
Ca2SiO4
orthorhombisch
Pnma

 
 
Fayalite
Fe22+SiO4
orthorhombisch
Pbnm

 
 
Forsterite
Mg2SiO4
orthorhombisch
Pbnm

 
 
Monticellite
CaMgSiO4
orthorhombisch
Pbnm

 
 
Tephroite
Mn2SiO4
orthorhombisch
Pbnm

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Actuality: 18. May 2022 - 14:42:08

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

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

German pages

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

English pages

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

Russian pages

 Webmineral.ru - search for: Тефроит

Mineral Dealer

German pages

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

Locations with GPS information