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Forsterite Mineral Data |
General Forsterite Information |
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Mg2SiO4 | ||
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Molecular Weight = 140.69 gm | ||
Magnesium 34.55 % Mg 57.29 % MgO | |||
Silicon 19.96 % Si 42.71 % SiO2 | |||
Oxygen 45.49 % O | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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Mg2(SiO4) | ||
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Ultramafic igneous rocks or dolomitic marbles. | ||
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Valid Species (Pre-IMA) 1824 | ||
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Mte. Somma, Vesuvius, Italy. Link to MinDat.org Location Data. | ||
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Named for Johann Forster, German naturalist. | ||
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Forsterite + Pronunciation ![]() |
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Chrysolite | ||
ICSD 9334 | |||
Olivine | |||
PDF 34-189 | |||
Peridot | |||
Forsterite Image | |||
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Forsterite Crystallography |
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a:b:c =0.4665:1:0.5866 | ||
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a = 4.756, b = 10.195, c = 5.981, Z = 4; V = 290.00 Den(Calc)= 3.22 | ||
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Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm | ||
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By Intensity(I/Io): 2.458(1), 2.512(0.7), 3.883(0.7), | ||
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Mouse |
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Physical Properties of Forsterite |
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{001} Good, {010} Distinct | ||
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Colorless, Green, Yellow, Yellow green, White. | ||
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3.21 - 3.33, Average = 3.27 | ||
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Transparent | ||
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Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
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Crystalline - Fine - Occurs as well-formed fine sized crystals. | ||
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Tabular - Form dimensions are thin in one direction. | ||
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6-7 - Orthoclase-Quartz | ||
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Non-fluorescent. | ||
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Vitreous (Glassy) | ||
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Nonmagnetic | ||
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white | ||
Optical Properties of Forsterite |
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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 |
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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. | ||
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colorless. | ||
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colorless. | ||
Calculated Properties of Forsterite |
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Bulk Density (Electron Density)=3.25 gm/cc note: Specific Gravity of Forsterite =3.27 gm/cc. |
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Fermion Index = 0.04 Boson Index = 0.96 |
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PEForsterite = 1.53 barns/electron U=PEForsterite x rElectron Density= 4.98 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Forsterite is Not Radioactive |
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Forsterite Classification |
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51.03.01.02 (51)Nesosilicate Insular SiO4 Groups Only | ||
(51.03)with all cations in octahedral [6] coordination | |||
(51.03.01)Olivine group | |||
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09.AC.05 09 - SILICATES (Germanates) | ||
09.A - Nesosilicates | |||
09.AC -Nesosilicates without additional anions; | |||
Other Forsterite Information |
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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 Search for Forsterite using: Visit our Advertisers for Forsterite : Ask about Forsterite here : Print or Cut-and-Paste your Forsterite Specimen Label here :
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