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About ClinoferrosiliteHide

brown, colourless, green
5 - 6
Crystal System:
Named for being the monoclinic polymorph of ferrosilite.
Dimorph of:
Isostructural with:
Pyroxene Group - Clinopyroxene Subgroup

Note: in some previous texts the name ferrosilite was used for what is now called clinoferrosilite, whereas the equivalent orthorhombic dimorph was called orthoferrosilite, so be careful when reading older texts.

Classification of ClinoferrosiliteHide


Clinoferrosilite and its relation to other pyroxenes


Previous petrological nomenclature of clinopyroxenes from basaltic magmas, note described here as 'ferrosilite' (after Poldervaart & Hess, 1951)

Approved, 'Grandfathered' (first described prior to 1959)

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2

14 : Silicates not Containing Aluminum
21 : Silicates of Fe and Mg

Pronounciation of ClinoferrosiliteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ClinoferrosiliteHide

brown, colourless, green
5 - 6 on Mohs scale

Optical Data of ClinoferrosiliteHide

Biaxial (+)
RI values:
nα = 1.764 nβ = 1.767 nγ = 1.792
Measured: 25° , Calculated: 40°
Max Birefringence:
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
very strong

Chemical Properties of ClinoferrosiliteHide

IMA Formula:

Crystallography of ClinoferrosiliteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 9.7085 Å, b = 9.0872 Å, c = 5.2284 Å
β = 108.432°
a:b:c = 1.068 : 1 : 0.575
Unit Cell V:
437.60 ų (Calculated from Unit Cell)
Synthetic sample (pure Fe2Si2O6). Mg-bearing sample has 9.53, 9.21, 5.15 Å, 107.63°.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000459ClinoferrosiliteOhashi Y, Burnham C W, Finger L W (1975) The effect of Ca-Fe substitution on the clinopyroxene crystal structure Fs80Wo20 American Mineralogist 60 423-43419750293
0000460ClinoferrosiliteOhashi Y, Burnham C W, Finger L W (1975) The effect of Ca-Fe substitution on the clinopyroxene crystal structure Fs85Wo15 American Mineralogist 60 423-43419750293
0000936ClinoferrosiliteSueno S, Kimata M, Prewitt C T (1984) The crystal structure of high clinoferrosilicate American Mineralogist 69 264-269198401323
0001679ClinoferrosiliteHugh-Jones D A, Woodland A B, Angel R J (1994) The structure of high-pressure C2/c ferrosilite and crystal chemistry of high-pressure C2/c pyroxenes American Mineralogist 79 1032-104119940293
0001680ClinoferrosiliteHugh-Jones D A, Woodland A B, Angel R J (1994) The structure of high-pressure C2/c ferrosilite and crystal chemistry of high-pressure C2/c pyroxenes American Mineralogist 79 1032-104119941.87293
0001681ClinoferrosiliteHugh-Jones D A, Woodland A B, Angel R J (1994) The structure of high-pressure C2/c ferrosilite and crystal chemistry of high-pressure C2/c pyroxenes American Mineralogist 79 1032-104119940293
CIF Raw Data - click here to close

Type Occurrence of ClinoferrosiliteHide

Other Language Names for ClinoferrosiliteHide

Relationship of Clinoferrosilite to other SpeciesHide

Other Members of this group:
AegirineNaFe3+Si2O6Mon. 2/m : B2/b
Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m : B2/b
Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : B2/b
BurnettiteCaVAlSiO6Mon. 2/m : B2/b
ClinoenstatiteMgSiO3Mon. 2/m : P21/b
DavisiteCaScAlSiO6Mon. 2/m : B2/b
DiopsideCaMgSi2O6Mon. 2/m : B2/b
EsseneiteCaFe3+[AlSiO6]Mon. 2/m : B2/b
GrossmaniteCaTi3+ AlSiO6Mon. 2/m : B2/b
HedenbergiteCaFe2+Si2O6Mon. 2/m : B2/b
JervisiteNaSc3+Si2O6Mon. 2/m : B2/b
JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
KushiroiteCaAl[AlSiO6]Mon. 2/m : B2/b
Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : P21/b
SpodumeneLiAlSi2O6Mon. 2/m : B2/b
Tissintite(Ca,Na,◻)AlSi2O6Mon. 2/m : B2/b
UM2001-19-SiO:AlCaMgNa(Na,Mg,Ca)(Mg,Al)Si2O6Mon. 2/m : B2/b
UM2003-36-SiO:CaNaNaCrSi2O6 - CaMgSi2O6Mon. 2/m : B2/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Clinoferrosilite associated with DiopsideCaMgSi2O6

Related Minerals - Nickel-Strunz GroupingHide

9.DA.ProtoenstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
9.DA.05EnstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05FerrosiliteFeSiO3Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.10ClinoenstatiteMgSiO3Mon. 2/m : P21/b
9.DA.10KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
9.DA.10Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : P21/b
9.DA.15Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : B2/b
9.DA.15DiopsideCaMgSi2O6Mon. 2/m : B2/b
9.DA.15EsseneiteCaFe3+[AlSiO6]Mon. 2/m : B2/b
9.DA.15HedenbergiteCaFe2+Si2O6Mon. 2/m : B2/b
9.DA.15JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
9.DA.15DavisiteCaScAlSiO6Mon. 2/m : B2/b
9.DA.15KushiroiteCaAl[AlSiO6]Mon. 2/m : B2/b
9.DA.15GrossmaniteCaTi3+ AlSiO6Mon. 2/m : B2/b
9.DA.20Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m : B2/b
9.DA.20Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
9.DA.25AegirineNaFe3+Si2O6Mon. 2/m : B2/b
9.DA.25JervisiteNaSc3+Si2O6Mon. 2/m : B2/b
9.DA.30SpodumeneLiAlSi2O6Mon. 2/m : B2/b

Related Minerals - Dana Grouping (8th Ed.)Hide 2/m : P21/b · 2H2OMon. 2/m : B2/b,Mn2+)Si2O6Mon. 2/m : P21/b 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.21.2Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Fd3m
14.21.5Anthophyllite◻{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
14.21.7 Magnesiocummingtonite◻{Mg2}{Mg5}(Si8O22)(OH)2
14.21.8Grunerite◻{Fe2+2}{Fe2+5}(Si8O22)(OH)2Mon. 2/m : B2/m
14.21.9MinnesotaiteFe2+3Si4O10(OH)2Tric. 1 : P1
14.21.11Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
14.21.12Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2Mon. 2/m : B2/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ClinoferrosiliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bowen, N.L. (1935) Ferrosilite as a natural mineral. American Journal of Science: 30: 481-494.
Foshag, W.F. (1936) New mineral names. American Mineralogist: 21: 678.
Poldervaart, A. and Hess, H.H. (1951) Pyroxenes in the Crystallization of Basaltic Magma. The Journal of Geology 59, no. 5 (Sep. 1951): 472-489.
Clark, J.R., Appleman, D.E., and Papike, J.J. (1969) Crystal-chemical characterization of clinopyroxenes based on eight new structure refinements. MSA Special Paper: 2: 31-50.
Sueno, S., Kimata, M., Prewitt, C.T. (1984): The crystal structure of high clinoferrosilite. American Mineralogist, 69, 264-269.
Hugh-Jones, D.A., Sharp, T., Angel, R.J., and Woodland, A. (1996) The transition of orthoferrosilite to high-pressure C2/c clinoferrosilite at ambient temperature. European Journal of Mineralogy: 8: 1337-1345.

Internet Links for ClinoferrosiliteHide

Localities for ClinoferrosiliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • New South Wales
    • Yancowinna Co.
      • Broken Hill district
Birch BH Book
  • Minas Gerais
Jour. of South American Earth Sci. 15:709–723
  • Henan
    • Pingdingshan
      • Lushan County
Dongyang Zhang, Huimin Su, Lei Tian, Jianli Kang, and Yang Gao (2010): Journal of Mineralogy and Petrology 31(1), 53-63
  • North Rhine-Westphalia
    • Arnsberg
      • Märkischer Kreis
        • Iserlohn
          • Letmathe
BLAß, G. & GRAF, H. W. (1995): Neufunde von bekannten Fundstellen (13). Mineralien-Welt 6 (3), 47-51.
  • Rhineland-Palatinate
    • Mayen-Koblenz District
      • Vordereifel
        • Ettringen
Blass, G., Graf, H.W., Kolitsch, U., Neue Funde aus der Vulkaneifel - ein Rückblick auf die Sammelsaison 2002, Mineralien-Welt 13/5, 2003
  • Jharkhand
    • Dumka District
Bhattacharjee, N., Ray, J., Ganguly, S., & Saha, A. (2012). Mineralogical Study of Gabbro-Anorthosite from Dumka, Chhotanagpur Gneissic Complex, Eastern Indian Shield. Journal of the Geological Society of India, 80(4), 481-492.
  • Sardinia
    • South Sardinia Province
Marzio Mamberti find & collection
  • Okayama Prefecture
    • Takahashi City
      • Bicchu-cho (Bitchu-cho)
        • Shitouyouze
Matsueda, H. (1980) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 5, #4, 15-77.
  • Kajiado County
Bowen N L (1935) “Ferrosilite” as a natural mineral. American Journal of Science 30, 481-494
Rocky Mountain (53rd) and South-Central (35th) Sections, GSA, Joint Annual Meeting (April 29–May 2, 2001) Session No. 7-Booth# 38.
  • Töv Province
    • Choir-Nyalga basin
      • Nyalga Combustion Metamorphic complex
Peretyazhko, I. S., Savina, E. A., Khromova, E. A., Karmanov, N. S., & Ivanov, A. V. (2018) Unique Clinkers and Paralavas from a New Nyalga Combustion Metamorphic Complex in Central Mongolia: Mineralogy, Geochemistry, and Genesis. Petrology, 26(2), 181-211.
Peretyazhko, I. S., Savina, E. A., Khrоmova, E. A., & Mills, S. (2017) Minerals of the rhönite-kuratite series in paralavas from a new combustion metamorphic complex in the Choir–Nyalga basin (Central Mongolia): composition, mineral assemblages and formation conditions. Mineralogical Magazine, 81(4), 949-974.
  • Chelyabinsk Oblast
    • Kaslinsky District
      • Kasli
Safina, N. P., Maslennikov, V. V., Maslennikova, S. P., Kotlyarov, V. A., Danyushevsky, L. V., Large, R. R., & Blinov, I. A. (2015). Banded sulfide-magnetite ores of Mauk copper massive sulfide deposit, Central Urals: Composition and genesis. Geology of Ore Deposits, 57(3), 197-212.
    • Korkinsky District
Sharygin, V. V., & Sokol, E. V. (2010). Metal-phosphide-sulfide association in paralavas from natural fires and burned waste dumps (Kuznetsk and Chelyabinsk coal basins, Russia). In Proceedings of «ICCFR2–Second International Conference on Coal Fire Research». Berlin, Germany (pp. 410-411).
[World of Stones 12:49]
South Africa
  • Free State
    • Fezile Dabi District
      • Vredefort
Cairncross, B. and Dixon, R., (1995) Cairncross, B., Dixon, R. (1995) Cairncross, B., Dixon, R. (1995) Minerals of South Africa. Geological Society of South Africa, PO Box 44283, Linden 2104, South Africa.. The Geological Society of South Africa, page 198
  • North West
    • Bojanala Platinum District Municipality
Excalibur Minerals photo ID 140072
    • Dr Kenneth Kaunda District Municipality
      • Potchefstroom
Fosso-Kankeu, E., Manyatshe, A., van der Berg, D., Lemmer, N., Waanders, F., & Tutu, H. (2015, November). Contaminants in Sediments across the Mooi and Vaal Rivers Network in The Vicinity of Potchefstroom. In 7th International Conference on Latest Trends in Engineering and Technology (ICLTET’2015).
  • Sughd
    • Zeravshan Range
      • Yagnob River
Sharygin, V.V., Sokol, E.V. and Belakovskii, D.I. (2009): Fayalite-sekaninaite paralava from the Ravat coal fire (central Tajikistan). Russian Geology and Geophysics 50, 703-721.
  • California
    • Inyo Co.
      • Coso Hot Springs
      • Sugarloaf Mountain
Bowen, N.L. (1935), Ferrosilite as a natural mineral: American Journal of Science, 5th. Series: 30: 481; Bradley, W.W. (1940), Thirty-sixth report of the State Mineralogist: California Division Mines Report 36: 107; Pemberton, H. Earl (1983), Minerals of California: 386.
Bowen, N.L. (1935), Ferrosilite as a natural mineral: American Journal of Science, 5th. Series: 30: 481 (491 ?); Bradley, W.W. (1940), Thirty-sixth report of the State Mineralogist: California Division Mines Report 36: 107; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 307.
  • Wyoming
    • Campbell Co.
      • Reno Junction
Gunnar Färber - Mineralienliste 3-2017.
    • Park Co.
Amer.J.Sci.(1935) ser. 4, 30, 481-494
矿物 and/or 产地  
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