Mineralogy Database

Ferrosilite Mineral Data

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General Ferrosilite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg)2Si2O6
Help on Composition: Composition: Molecular Weight = 232.32 gm
   Magnesium  10.46 %  Mg   17.35 % MgO
   Iron       24.04 %  Fe   30.93 % FeO
   Silicon    24.18 %  Si   51.73 % SiO2
   Oxygen     41.32 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+MgSi2O6
Help on Environment: Environment: Found in basic and ultrabasic igneous rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1935
Help on Locality: Locality: Unspecified locality in Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its composition (Ferrous Silicate).
Help on Name Pronunciation: Name Pronunciation: Ferrosilite + Pronunciation Say FERROSILITE
Help on Synonym: Synonym: ICSD 17055
  PDF 29-721

Ferrosilite Image

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Comments: Transparent, brown prismatic blades of ferrosilite crystals on matrix.
Location: Summit Rock, Diamond Lake, Douglas County, Oregon, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Ferrosilite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0288:1:0.5768
Help on Cell Dimensions: Cell Dimensions: a = 18.418, b = 9.078, c = 5.237, Z = 8; V = 875.62 Den(Calc)= 3.52
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.91(1), 4.61(0.9), 3(0.8),3.23(0.7), 2.59(0.4), 2.52(0.3), 6.46(0.3), 1.781(0.2),

Physical Properties of Ferrosilite

Help on Cleavage: Cleavage: {210} Good, {100} Parting
Help on Color: Color: Colorless, Green, Dark brown, Nearly black.
Help on Density: Density: 3.88 - 4.02, Average = 3.95
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale brownish gray

Optical Properties of Ferrosilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.059 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2123,KPDmeas= 0.1892,KC= 0.2004
Ncalc = 1.71 - 1.81
Help on Optical Data: Optical Data: Biaxial (+), a=1.71-1.767, b=1.723-1.77, g=1.726-1.788, bire=0.0160-0.0210
Help on Pleochroism (x): Pleochroism (x): pinkish brown.
Help on Pleochroism (z): Pleochroism (z): greenish brown.

Calculated Properties of Ferrosilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.88 gm/cc
note: Specific Gravity of Ferrosilite =3.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEFerrosilite = 8.29 barns/electron
U=PEFerrosilite x rElectron Density= 32.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferrosilite is Not Radioactive

Ferrosilite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.02)Orthopyroxenes Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DA.05 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
09.DA.05 Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m
09.DA.05 Akimotoite! (Mg,Fe)SiO3 R 3 3
09.DA.05 Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m
09.DA.05 Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m

Other Ferrosilite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Ferrosilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - University of Colorado - Mineral Structure Data

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Dana No: Strunz No: 09.DA.05





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