Mineralogy Database

Clinoferrosilite Mineral Data

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General Clinoferrosilite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg)2Si2O6
Help on Composition: Composition: Molecular Weight = 248.09 gm
   Magnesium   4.90 %  Mg    8.12 % MgO
   Iron       33.77 %  Fe   43.44 % FeO
   Silicon    22.64 %  Si   48.44 % SiO2
   Oxygen     38.69 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+1.5Mg0.5Si2O6
Help on Environment: Environment: As acicular crystals in lithophysae in obsidian (Lake Naivasha, Kenya). Dimorphous with ferrosilite; forms a series with clinoenstatite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1935
Help on Locality: Locality: From near Lake Naivasha, Rift Valley, Kenya. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its monoclinic crystal system and chemical identity with ferrosilite.
Help on Synonym: Synonym: Clinohypersthene
  ICSD 30675
  PDF 17-548

Clinoferrosilite Image

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Comments: Light green crystalline clinoferrosilite with dark green diopside.
Location: Bushveld Complex, Merensky Reef, Rustenberg, Northern Province, South Africa. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Clinoferrosilite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0347:1:0.5591
Help on Cell Dimensions: Cell Dimensions: a = 9.53, b = 9.21, c = 5.15, Z = 4; beta = 107.633° V = 430.78 Den(Calc)= 3.83
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.03(1), 3.23(0.8), 3.35(0.8),

Physical Properties of Clinoferrosilite

Help on Cleavage: Cleavage: {110} Distinct
Help on Color: Color: Brown, Colorless, Green.
Help on Density: Density: 4.068
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Clinoferrosilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2022,KPDmeas= 0.1903,KC= 0.1987
Ncalc = 1.76 - 1.81
Help on Optical Data: Optical Data: Biaxial (+), a=1.764, b=1.767, g=1.792, bire=0.0280, 2V(Calc)=40, 2V(Meas)=25.

Calculated Properties of Clinoferrosilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.74 gm/cc
note: Specific Gravity of Clinoferrosilite =3.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEClinoferrosilite = 11.05 barns/electron
U=PEClinoferrosilite x rElectron Density= 41.28 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Clinoferrosilite is Not Radioactive

Clinoferrosilite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.01)P2/c clinopyroxenes Clinoenstatite Mg2Si2O6 P 21/c 2/m Clinoferrosilite (Fe,Mg)2Si2O6 P 21/c 2/m Kanoite (Mn,Mg)2Si2O6 P 21/c 2/m Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 09.DA.10 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.10 Clinoenstatite Mg2Si2O6 P 21/c 2/m
09.DA.10 Clinoferrosilite (Fe,Mg)2Si2O6 P 21/c 2/m
09.DA.10 Kanoite (Mn,Mg)2Si2O6 P 21/c 2/m
09.DA.10 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 21/c 2/m

Other Clinoferrosilite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Clinoferrosilite :
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

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Dana No: Strunz No: 09.DA.10





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