Mineralogy Database

Forsterite Mineral Data

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General Forsterite Information

Help on Chemical  Formula: Chemical Formula: Mg2SiO4
Help on Composition: Composition: Molecular Weight = 140.69 gm
   Magnesium  34.55 %  Mg   57.29 % MgO
   Silicon    19.96 %  Si   42.71 % SiO2
   Oxygen     45.49 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2(SiO4)
Help on Environment: Environment: Ultramafic igneous rocks or dolomitic marbles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1824
Help on Locality: Locality: Mte. Somma, Vesuvius, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Johann Forster, German naturalist.
Help on Name Pronunciation: Name Pronunciation: Forsterite + Pronunciation Say FORSTERITE
Help on Synonym: Synonym: Chrysolite
  ICSD 9334
  Olivine
  PDF 34-189
  Peridot
 

Forsterite Image

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  Forsterite   Olivine

Comments: Peridot (Forsterite) recrystallized at the base.
Location: Skardu, Nooristan, Pakistan. Scale: 2.5 x 2.7 cm.
© Fabre Minerals

Forsterite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4665:1:0.5866
Help on Cell Dimensions: Cell Dimensions: a = 4.756, b = 10.195, c = 5.981, Z = 4; V = 290.00 Den(Calc)= 3.22
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.458(1), 2.512(0.7), 3.883(0.7),
Help on Forms: Forms:

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Drag1 - Manipulate Crystal
Drag2 - Resize

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Help on Above

Forms: ( 1 0 1) ( 1 0 0) ( 0 1 0) ( 1 1 0) ( 1 1 1) ( 0 0 1) ( 0 1 1)

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Physical Properties of Forsterite

Help on Cleavage: Cleavage: {001} Good, {010} Distinct
Help on Color: Color: Colorless, Green, Yellow, Yellow green, White.
Help on Density: Density: 3.21 - 3.33, Average = 3.27
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Forsterite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.068 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2172,KPDmeas= 0.2139,KC= 0.2034
Ncalc = 1.65 - 1.68
Help on Optical Data: Optical Data: Biaxial (-), a=1.636-1.73, b=1.65-1.739, g=1.669-1.772, bire=0.0330-0.0420, 2V(Calc)=56-84, 2V(Meas)=74-90. Dispersion r > v or r < v.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
 

Calculated Properties of Forsterite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.25 gm/cc
note: Specific Gravity of Forsterite =3.27 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEForsterite = 1.53 barns/electron
U=PEForsterite x rElectron Density= 4.98 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Forsterite is Not Radioactive
 

Forsterite Classification

Help on  Dana Class: Dana Class: 51.03.01.02 (51)Nesosilicate Insular SiO4 Groups Only
  (51.03)with all cations in octahedral [6] coordination
  (51.03.01)Olivine group
 
51.03.01.00 Olivine* (Mg,Fe)2SiO4 Pbnm 2/m 2/m 2/m
 
51.03.01.01 Fayalite Fe2SiO4 Pbnm 2/m 2/m 2/m
 
51.03.01.02 Forsterite Mg2SiO4 Pbnm 2/m 2/m 2/m
 
51.03.01.03 Liebenbergite (Ni,Mg)2SiO4 Pbnm 2/m 2/m 2/m
 
51.03.01.04 Tephroite Mn2SiO4 P nma 2/m 2/m 2/m
 
51.03.01.05 Laihunite FeFe2(SiO4)2 P 21/b 2/m
Help on  Strunz Class: Strunz Class: 09.AC.05 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AC -Nesosilicates without additional anions;
 
09.AC.05 Forsterite Mg2SiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Glaucochroite CaMnSiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Fayalite Fe2SiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Olivine* (Mg,Fe)2SiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Kirschsteinite CaFeSiO4 Pbmn 2/m 2/m 2/m
 
09.AC.05 Laihunite FeFe2(SiO4)2 P 21/b 2/m
 
09.AC.05 Liebenbergite (Ni,Mg)2SiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Tephroite Mn2SiO4 P nma 2/m 2/m 2/m
 

Other Forsterite Information

Help on See Also: See Also: Links to other databases for Forsterite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - CalTech Mineral Spectroscopy
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Dunn)
8 - GeoScienceWorld
9 - Glendale Community College
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - HyperPhysics
15 - MinDAT
16 - Mineralienatlas (Deutsch)
17 - Online Mineral Museum
18 - QUT Mineral Atlas
19 - Ruff.Info
20 - University of Colorado - Mineral Structure Data
21 - WWW-MINCRYST

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Print or Cut-and-Paste your Forsterite Specimen Label here :

Forsterite

Mg2SiO4
Dana No: 51.03.01.02 Strunz No: 09.AC.05
Locality:

 

Notes:

 

 


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