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Clinoferrosilite

A valid IMA mineral species - grandfathered
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09079720014946295071158.jpg
Clinoferrosilite, etc.

Merensky Reef, Bojanala Platinum District Municipality, North West, South Africa
05272310015806807205653.jpg
Clinoferrosilite

Sant'Antioco, South Sardinia Province, Sardinia, Italy
06499050017077104864085.jpg
Clinoferrosilite, etc.

Sant'Antioco, South Sardinia Province, Sardinia, Italy
09079720014946295071158.jpg
Clinoferrosilite, etc.

Merensky Reef, Bojanala Platinum District Municipality, North West, South Africa
09209290015806628113049.jpg
Clinoferrosilite

Sant'Antioco, South Sardinia Province, Sardinia, Italy
02408860017058478055163.jpg
Clinoferrosilite, etc.

Sant'Antioco, South Sardinia Province, Sardinia, Italy
09079720014946295071158.jpg
Clinoferrosilite, etc.

Merensky Reef, Bojanala Platinum District Municipality, North West, South Africa
05272310015806807205653.jpg
Clinoferrosilite

Sant'Antioco, South Sardinia Province, Sardinia, Italy
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About ClinoferrosiliteHide

Formula:
Fe2+2Si2O6
Simplified: FeSiO3.
Colour:
Brown, colourless, green
Hardness:
5 - 6
Specific Gravity:
4.068 (Calculated)
Crystal System:
Monoclinic
Name:
Named for being the monoclinic polymorph of ferrosilite.
Isostructural with:
Clinoenstatite
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.


Unique IdentifiersHide

Mindat ID:
1073
Long-form identifier:
mindat:1:1:1073:9
GUID
(UUID V4):
74596705-1367-4b97-94c7-170f1c2457ac

Classification of ClinoferrosiliteHide

TRI__07ac0b4df776077cf8e2700ca9c5bb94.png

Clinoferrosilite and its relation to other pyroxenes

TRI__b91f3b71ec67273696a975a76a5020ab.png

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

IMA Classification of ClinoferrosiliteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
Strunz-mindat (2024):
9.DA.10

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
Dana 8th ed.:
65.1.1.2

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:
14.21.4

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
CfsIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
CfsKretz (1983)Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277–279.
CfsSiivolam & Schmid (2007)Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download
CfsWhitney & Evans (2010)Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371

Pronunciation of ClinoferrosiliteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of ClinoferrosiliteHide

Transparency:
Transparent, Translucent
Colour:
Brown, colourless, green
Streak:
White
Hardness:
5 - 6 on Mohs scale
Cleavage:
Distinct/Good
Density:
4.068 g/cm3 (Calculated)

Optical Data of ClinoferrosiliteHide

Type:
Biaxial (+)
RI values:
nα = 1.764 nβ = 1.767 nγ = 1.792
2V:
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:
High
Dispersion:
very strong
Optical Extinction:
Z ∧ c = 31°.

Chemistry of ClinoferrosiliteHide

Mindat Formula:
Fe2+2Si2O6

Simplified: FeSiO3.
Elements listed:
Fe, O, Si - search for minerals with similar chemistry

Crystallography of ClinoferrosiliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 9.7085 Å, b = 9.0872 Å, c = 5.2284 Å
β = 108.432°
Ratio:
a:b:c = 1.068 : 1 : 0.575
Unit Cell V:
437.60 ų (Calculated from Unit Cell)
Z:
4
Comment:
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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.035 Å(100)
2.603 Å(63)
2.909 Å(55)
2.408 Å(53)
2.161 Å(51)
4.605 Å(49)
3.234 Å(40)
Comments:
Synthetic.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4a: Earth’s earliest continental crust>4.4-3.0
20 : Acidic volcanic rocks

Type Occurrence of ClinoferrosiliteHide

Type Locality:
ⓘ Obsidian Cliff, Park County, Wyoming, USA
General Appearance of Type Material:
Needles about 0.05 x 0.005 mm in size.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, number 102793.
Geological Setting of Type Material:
Lithophysae of obsidian.

Other Language Names for ClinoferrosiliteHide

Relationship of Clinoferrosilite to other SpeciesHide

Member of:
Clinopyroxene Subgroup > Pyroxene Group
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
ColomeraiteNaTi3+Si2O6Mon. 2/m : B2/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
JadeiteNa(Al,Fe3+)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
KosmochlorNaCrSi2O6Mon. 2/m : B2/b
KushiroiteCaAl[AlSiO6]Mon. 2/m : B2/b
NamansiliteNaMn3+Si2O6Mon. 2/m : B2/b
NatalyiteNaV3+Si2O6Mon. 2/m : B2/b
Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon. 2/m : B2/b
Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : P21/b
RyabchikoviteCuMgSi2O6Mon. 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:
7 photos of Clinoferrosilite associated with AmethystSiO2
5 photos of Clinoferrosilite associated with SanidineK(AlSi3O8)
1 photo of Clinoferrosilite associated with DiopsideCaMgSi2O6
1 photo of Clinoferrosilite associated with QuartzSiO2
1 photo of Clinoferrosilite associated with Hemleyite(Fe2+0.48Mg0.37Ca0.04Na0.04Mn2+0.03Al0.03Cr3+0.01)sum=1.00Si1.00O3
1 photo of Clinoferrosilite associated with ClinoenstatiteMgSiO3
1 photo of Clinoferrosilite associated with Fayalite-Forsterite Series
1 photo of Clinoferrosilite associated with Maskelynite
1 photo of Clinoferrosilite associated with Taenite(Fe,Ni)

Related Minerals - Strunz-mindat GroupingHide

9.DA.ProtoenstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
9.DA.RyabchikoviteCuMgSi2O6Mon. 2/m : P21/b
9.DA.ColomeraiteNaTi3+Si2O6Mon. 2/m : B2/b
9.DA.05Donpeacorite(Mn,Mg)MgSi2O6Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05EnstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05FerrosiliteFe2+2Si2O6Orth. 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.15 vaJeffersoniteCa(Mn,Zn,Fe)Si2O6
9.DA.15JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
9.DA.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)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.25JadeiteNa(Al,Fe3+)Si2O6Mon. 2/m : B2/b
9.DA.25JervisiteNaSc3+Si2O6Mon. 2/m : B2/b
9.DA.25KosmochlorNaCrSi2O6Mon. 2/m : B2/b
9.DA.25NamansiliteNaMn3+Si2O6Mon. 2/m : B2/b
9.DA.25NatalyiteNaV3+Si2O6Mon. 2/m : B2/b
9.DA.25Tissintite(Ca,Na,◻)AlSi2O6Mon. 2/m : B2/b
9.DA.30SpodumeneLiAlSi2O6Mon. 2/m : B2/b
9.DA.35HiroseiteFeSiO3Orth. mmm (2/m 2/m 2/m) : Pnma

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.

Internet Links for ClinoferrosiliteHide

References 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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia
 
  • New South Wales
    • Yancowinna Co.
      • Broken Hill district
Birch (1999)
Brazil
 
  • Minas Gerais
Jour. of South American Earth Sci. ...
China
 
  • Henan
    • Pingdingshan
      • Lushan County
Dongyang Zhang et al. (2010)
Finland
 
  • North Savo
    • Rautalampi
Kallio et al. (2021)
Germany
 
  • North Rhine-Westphalia
    • Arnsberg
      • Märkischer Kreis
        • Iserlohn
          • Letmathe
            • Helmke quarry nature reserve
BLAß et al. (1995)
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Vordereifel
        • Ettringen
Blass
India
 
  • Jharkhand
    • Dumka District
Bhattacharjee et al. (2012)
Italy
 
  • Sardinia
    • South Sardinia Province
Marzio Mamberti find & collection
Japan
 
  • Okayama Prefecture
    • Takahashi City
      • Bitchū
        • Shitouyouze
Matsueda (1980)
Kenya
 
  • Kajiado County
Bowen N L (1935)
Rocky Mountain (53rd)
Mongolia
 
  • Dornogovi Province
    • Erdene District
Savina et al. (2020)
  • Töv Province
    • Choir-Nyalga basin
      • Nyalga Combustion Metamorphic complex
Peretyazhko et al. (2018)
Peretyazhko et al. (2017)
Russia
 
  • Chelyabinsk Oblast
    • Kaslinsky District
      • Kasli
Safina et al. (2015)
    • Korkinsky District
Sharygin et al. (2010)
[World of Stones 12:49]
South Africa
 
  • Free State
    • Fezile Dabi District Municipality
      • Ngwathe Local Municipality
Cairncross et al. (1995)
  • North West
    • Bojanala Platinum District Municipality
Excalibur Minerals photo ID 140072
    • Dr Kenneth Kaunda District Municipality
      • JB Marks Local Municipality
        • Potchefstroom
Fosso-Kankeu et al. (2015, November)
Tajikistan
 
  • Sughd
    • Zeravshan Range
      • Yagnob River
Sharygin et al. (2009)
USA
 
  • California
    • Inyo County
      • Coso Hot Springs
 ...
      • Sugarloaf Mountain
Bowen (1935) +2 other references
Bowen (1935) +2 other references
  • Wyoming
    • Campbell County
      • Reno Junction
Gunnar Färber - Mineralienliste 3-2017.
    • Park County
Amer.J.Sci. (1935)
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