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Forsterite

Pictures (73 Images total)

Forsterit
Views (Image: 1163776091): 10186, Rating: 9
Forsterit

Bildbreite: 1,5 mm; Fundort: Wannenköpfe, Ochtendung, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Fred Kruijen
Contribution: Fred Kruijen 2006-11-17
Locality: Wannenköpfe / Ochtendung / Maifeld, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Forsterit
Views (Image: 1359313855): 4602, Rating: 9
Forsterit (SNr: A000925)

Blockige gelbgrüne Kristalle, BB = 3,8 mm, Fundort: Stbr. Caspar, Ettringer Bellerberg, Ettringen, Eifel, Deutschland.
Collection: Lithothek der Münchener Micromounter
Copyright: Bebo
Contribution: Münchener Micromounter 2013-01-27
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Mayen / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Forsterit
Views (Image: 1174918865): 10794, Rating: 9
Forsterit

Bildbreite: 3 mm; Fundort Stbr. Caspar, Ettringer Bellerberg, Ettringen, Mayen, Eifel
Copyright: Stephan Wolfsried
Contribution: Hg 2007-03-26
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Mayen / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Forsterit
Views (Image: 1255428890): 5816
Forsterit

Bildbreite: 3 mm; Fundort: Nickenicher Weinberg (Sattelberg), Nickenich, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Stephan Wolfsried
Contribution: Hg 2009-10-13
Locality: Nickenicher Weinberg (Sattelberg) / Nickenich / Pellenz, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland
Forsterit
Views (Image: 1256716433): 6004
Forsterit

Größe: bis 2,07 mm; Fundort: Monte Somma, Somma-Vesuv-Komplex, Neapel, Kampanien (Campania), Italien
Copyright: Matteo Chinellato
Contribution: Hg 2009-10-28
Locality: Monte Somma / Somma-Vesuv-Komplex / Neapel, Provinz / Kampanien (Campania), Region / Italien
Forsterit
Views (Image: 1166734455): 3183
Forsterit

Bildbreite: 3 mm; Fundort Emmelberg, Üdersdorf, Eifel, Rheinland-Pfalz, Deutschland
Copyright: Stephan Wolfsried
Contribution: Hg 2006-12-21
Locality: Emmelberg / Üdersdorf / Daun / Vulkaneifel, Landkreis / Rheinland-Pfalz / Deutschland

Collectors Summary

Color farblos, grün, gelb, rot, gelbgrün, weiß, schwarz, schwarzgrün
Streak color weiß
Hardness (Mohs) 7
Solubility +++ Säuren
Crystal System orthorhombisch, Pbnm

Chemism

Chem­ical formula

Mg2SiO4

Chem­ical com­po­si­tion

Magnesium, Silicium, Sauerstoff

Unit weight: 140.69337 u; Number of atoms in the formula: 7

Info

Empirical formula:

Mg2SiO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

45.49

4

57.14

15.9994300

63.9977200
Magnesium

Mg

34.55

2

28.57

24.3050600

48.6101200
Silicon

Si

19.96

1

14.29

28.0855300

28.0855300

Anal­y­sis wt%

SiO2 : 40.70, Al2O3 : 0.60, Fe2O3 : 1.60, FeO : 4.47, MgO : 51.84, H2O : 0.51 (Ref: Doklady Akademiia Nauk, SSSR 47)

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.04-010

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

Clas­sifica­tion by Hölzel

9.AB.100

9: SILICATES
A: Nesosilicates
B: Olivine-Group

Dana 8th edi­tion

51.03.01.02

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

farblos, grün, gelb, rot, gelbgrün, weiß, schwarz, schwarzgrün

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent

max. Birefrin­gence

0.035
Birefringence chart\! Forsterite title=Birefringence chart Forsterite

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

1.635

RI value β

1.651

RI value γ / ε

1.670

Ri mean

1.652

2V angle

Biaxial (+) 82°

Optical Data Luminescence

Color LW-UV (365nm)

  

gelblich weiß

Color SW-UV (254nm)

  

gelblich weiß

LW-UV Other Col­ors

    

blassgelb, gelblich

SW-UV Other Col­ors

    

blassgelb, gelblich

Most Common Acti­vator

Mn2+

Other Acti­vators

Cr3+, Fe3+, O

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Ther­mo­lu­mi­nes­cence

vorhanden

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pbnm

Cell param­e­ters a (Å)

4.756

Cell param­e­ters b (Å)

10.195

Cell param­e­ters c (Å)

5.981

Cell param­e­ters a/b or c/a

0.467

Cell param­e­ters c/b

0.587

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

290.003

X-Ray Pow­der Diffrac­tion

3.881(80),
2.765(70),
2.510(80),
2.457(100),
2.267(60),
2.247(40),
1.748(70),
1.478(30)
XRD chart Forsterite

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)

7

VHN (Hard­ness Vick­ers)

1300 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.21 - 3.33 / Durchschnittlich = 3.27

3.222 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Italien/Kampanien (Campania), Region/Neapel, Provinz/Somma-Vesuv-Komplex/Monte Somma

Preface

Author (Name, Year)

Lévy, 1824

Addi­tional Informa­tion

Benannt nach dem englischen Mineraliensammler- und Händler Adolarius Jacob Forster (1739-1806).

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 262

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 - 16:15:05

Other languages

German

Forsterit

Spanish

Forsterita

English

Forsterite

French

Forsterite

Russian

Форстерит

Traditional Chinese

鎂橄欖石

Simplified Chinese

镁橄榄石

Alternative Name

German

Abendsmaragd

László 247 (1995)

Boltonit

Boltonita

Boltonite

Peridoto Bianco

White Olivine

CNMNC symbol

Symbol

Fo

Rock part of

 
Rocks

 
 
igneous rocks and sediments

 
 
 
crystalline igneous rocks

 
 
 
 
exotic crystalline rocks

 
 
 
 
 
lamproite  

 
 
 
 
 
 
olivine-diopside-richterite-madupitic lamproite

 
 
 
 
 
 
 
jumillite  

 
 
 
 
normal crystalline rocks

 
 
 
 
 
coarse-grained crystalline rocks

 
 
 
 
 
 
gabbroic-rock

 
 
 
 
 
 
 
gabbro (group)

 
 
 
 
 
 
 
 
gabbro (s.s.)

 
 
 
 
 
 
 
 
 
allivalite  

Refresh list | View legend

Hint

- Essential mineral - Important for the classification of the rock.
- Accessory or non-essential mineral - this minerals are common, sometimes major part of, but are not always present.

Actuality: 18. May 2022 - 16:15:07

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