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Ferrosilite

A valid IMA mineral species - grandfathered
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Originally a hypothetical mineral named by Henry Stevens Washington [1867-1934] in 1903. First used to name natural material in 1935 by Norman L. Bowen.
Polymorph of:
Clinoferrosilite,Hemleyite,Hiroseite,Pyroxferroite,Roedderite
Enstatite-Ferrosilite Series

Note: The name has been used in the past to describe the monoclinic dimorphclinoferrosilite, with the orthorhombic dimorph having the nameorthoferrosilite so be careful when reading older texts.


Unique Identifiers

IMA Classification of Ferrosilite
Strunz-mindat (2025):
9.DA.05

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
Dana 8th ed.:
65.1.2.2

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:
14.19.2

14 : Silicates not Containing Aluminum
19 : Silicates of Fe

Mineral SymbolsJolyon RalphUnited Kingdom

Physical Properties of Ferrosilite
Transparency:
Transparent, Translucent
Colour:
Dark brown to black.
Comment:
Bright-green ferrosilite has not been chemically verified, althought it has been verified by XRD as an orthopyroxene.
Streak:
Pale gray brown
Hardness:
5 - 6 onMohs scale
Tenacity:
Brittle
Cleavage:
Very Good
{210}
Parting:
{100}, {010}
Fracture:
Irregular/Uneven, Splintery
Density:
3.60 - 4.00 g/cm3 (Measured)    4.00 g/cm3 (Calculated)

Optical Data of Ferrosilite
Surface Relief:
High
Dispersion:
r > v moderate
Optical Extinction:
Parallel
Pleochroism:
Weak
Comments:
X pinkish brown, Z greenish brown

Chemistry of Ferrosilite
Common Impurities:
Ca,Na,K,Al,Co,Ni,Mn,Ti,Cr

Crystallography of Ferrosilite

Other Language Names for Ferrosilite

Relationship of Ferrosilite to other Species
Other Members of this group:
Donpeacorite(Mn,Mg)MgSi2O6Orth.mmm(2/m2/m2/m) :Pbca
EnstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbca
ProtoenstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbcn
Forms a series with:
EnstatiteEnstatite-Ferrosilite Series

Common AssociatesMon. 2/m :B2/b9.DA.ProtoenstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbcn9.DA.RyabchikoviteCuMgSi2O6Mon. 2/m :P21/b9.DA.05Donpeacorite(Mn,Mg)MgSi2O6Orth.mmm(2/m2/m2/m) :Pbca9.DA.05EnstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbca9.DA.10ClinoenstatiteMgSiO3Mon. 2/m :P21/b9.DA.10ClinoferrosiliteFe2+2Si2O6Mon. 2/m :P21/b9.DA.10KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m :P21/b9.DA.10Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m :P21/b9.DA.15GrossmaniteCaTi3+ AlSiO6Mon. 2/m :B2/b9.DA.15DiopsideCaMgSi2O6Mon. 2/m :B2/b9.DA.15 vaJeffersoniteCa(Mn,Zn,Fe)Si2O69.DA.15HedenbergiteCaFe2+Si2O6Mon. 2/m :B2/b9.DA.15JohannseniteCaMn2+Si2O6Mon. 2/m :B2/b9.DA.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon. 2/m :B2/b9.DA.15EsseneiteCaFe3+[AlSiO6]Mon. 2/m :B2/b9.DA.15KushiroiteCaAl[AlSiO6]Mon. 2/m :B2/b9.DA.15Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m :B2/b9.DA.15DavisiteCaScAlSiO6Mon. 2/m :B2/b9.DA.20Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m :B2/b9.DA.20Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m9.DA.25JadeiteNa(Al,Fe3+)Si2O6Mon. 2/m :B2/b9.DA.25NamansiliteNaMn3+Si2O6Mon. 2/m :B2/b9.DA.25NatalyiteNaV3+Si2O6Mon. 2/m :B2/b9.DA.25AegirineNaFe3+Si2O6Mon. 2/m :B2/b9.DA.25JervisiteNaSc3+Si2O6Mon. 2/m :B2/b9.DA.25Tissintite(Ca,◻)AlSi2O6Mon. 2/m :B2/b9.DA.25KosmochlorNaCrSi2O6Mon. 2/m :B2/b9.DA.30SpodumeneLiAlSi2O6Mon. 2/m :B2/b9.DA.35HiroseiteFeSiO3Orth.mmm(2/m2/m2/m) :Pnma

Fluorescence of Ferrosilite

Other Information
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  • Raman and XRD data at RRUFF project
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    • References for FerrosiliteⓘGour OumelalenL. Latouche : "L'orthoferrosilite et les roches associées de la région des Gour Oumeladen (N.E. Ahaggar, Algérie)Bendaoud et al. (2003)
    Angola
     
    Sighinolfi et al. (1990)
    Antarctica
     
    Graham (1979)
    Argentina
     
    Saavedra et al. (2016)
    Australia
     
    Sutton (2017)Sutton & Mills (2012)Simpson (1948)
    Austria
     
    Taucher et al. (1998)
    Brazil
     
    Campo-Rodríguez et al. (2021)
    Cameroon
     
    Tetsopgang et al. (2003)
    Canada
     
    Pan et al. (1993)+1 other referenceKlein (1966)WaardBerg et al. (1976)Klein (1966)www.geosurv.gov.nf.ca/gacmap/LAB2.html.Miller et al. (1995)Owen et al. (1988)Can. Mineral. (1993)DeerGrew et al. (2010)Sage (1987)Olivier Langelier CollectionDaryl MacfarlandSteadman et al. (2015)
    China
     
    Xue et al. (2023)He et al. (2024)Zhang et al. (2023)Yingjun Liu et al. (1983)Yaohui Jiang et al. (2005)Fengmei Chai et al. (2006)
    Finland
     
    Henry (1935)+1 other reference
    France
     
    Berbain et al. (2005)
    Germany
     
    Bender et al. (1994)Blass et al. (2006)Blass (2010)Weiß et al. (1999)Blass et al. (2006)Blass et al. (2006)Blass et al. (2006)Blass et al. (2006)Blass et al. (2006)Marko Burkhardt Collection
    Hungary
     
    Sándor et al. (2005)
    India
     
    LeelanandamAnantha Iyer et al. (1975)Anantha Iyer et al. (1975)Howie (1955)N. Subba Reddy (1982)
    Indian Ocean
     
    Maciąg et al. (2019)
    Italy
     
    Ciriotti et al. (2011)
    Japan
     
    PXRD by John AttardPXRD by John AttardKunoKunoKunoMatsueda (1980)Analyses by Dr Shinichi Kuramoto and Dr ...Analyses by Dr Shinichi Kuramoto and Dr ...
    Kenya
     
    Rocky Mountain (53rd)
    Lithuania
     
    Mason B. (1979)
    Mongolia
     
    Savina et al. (2020)+1 other reference
    Myanmar
     
    Zhang et al. (2025)
    New Zealand
     
    Hiess et al. (2007)J. W. COLE et al. (Whakaari)ganko.eps.nagoya-u.ac.jp (n.d.)
    North Macedonia
     
    Đorđević et al. (2024)
    Northwest Africa Meteorites
     
    Xia et al. (2021)www.lpi.usra.edu (2015)+5 other references
    Norway
     
    DeerDevaraju et al. (1974)Phillip Betancourt
    Philippines
     
    Ruth et al. (2021)
    Poland
     
    Borkowska M. 1985 - Skały gabrowe ...Krzemińska E. & Bagiński B. 2003: THE KOŚCIERZYNA AND ŻARNOWIEC ENDERBITES ( N-POLAND)Krzemińska E. & Bagiński B. 2003: THE KOŚCIERZYNA AND ŻARNOWIEC ENDERBITES ( N-POLAND)
    Romania
     
    Hîrtopanu (2006)+3 other references
    Russia
     
    Am Min 90:1402-1412 (deposit item)Dugushkina et al. (2023)Safina et al. (2015)Sharygin et al. (2010)Barkov et al. (2016)+1 other referenceShchukina et al. (Vol. 473, No. 1, pp. 333-337)Erokhin et al. (2017, December)Pavel.M. Kartashov (n.d.)Yakovenchuk et al. (2008)Smol’kin et al. (2023)Timofeeva et al. (2014)Kazachenko et al. (2013)Коневин et al. (2020)Trunilina et al. (2024)Trunilina et al. (2024)Bunch (1975)Tatarinov et al. (2021)
    Slovakia
     
    Koděra (1986)Myšľan et al. (2024)
    South Africa
     
    Cairncross et al. (1995)
    South Korea
     
    Lee (ed)+7 other references
    Spain
     
    Martin-Izard et al. (1995)
    Sweden
     
    Henry (1935)Sundius (1932)+1 other reference
    UK
     
    Henry (1935)+1 other referenceMuirHenry (1935)+2 other referencesRender (n.d.) ...
    Ukraine
     
    Sharygin et al. (2014)Gurov et al. (2015)
    USA
     
    Larsen et al. (1948 [1950])EspenshadeEspenshadeHanbook of MineralogyRocks&Min. 76:256NY State Museum spec. no. 15862Speer et al. (2008)EL-Shazley et al. (2011)- (Bill Wise, Northern California Mineralogical Association spring 2003 newsletter)+1 other referenceMineralogical Society of America - ...
    The Moon
     
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