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Clinoferrosilite

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Merensky Reef, Western Bushveld Complex, Northwest Province, South Africa
© 2007, J. Weissman

Formula:
Fe
2+
 
(Fe
2+
 
,Mg)[Si
 
2
O
 
6
]
System:MonoclinicColour:brown, colourless, green
Hardness:5 - 6


Pyroxene Group - Clinopyroxene Subgroup

Classification of Clinoferrosilite

IMA status:Approved
Strunz 8th edition ID:8/F.01-20
Nickel-Strunz 10th (pending) edition ID:9.DA.10

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
Dana 8th edition ID: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
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Type Occurrence of Clinoferrosilite

Type Locality:Obsidian Cliff, Yellowstone National Park, Park Co., Wyoming, USA
Year of Discovery:1935

Physical Properties of Clinoferrosilite

Colour:brown, colourless, green
Streak:white
Hardness (Mohs):5 - 6
Cleavage:Distinct/Good

Crystallography of Clinoferrosilite

Crystal System:Monoclinic
Cell Parameters:a = 9.53Å, b = 9.21Å, c = 5.15Å
β = 107.63°
Ratio:a:b:c = 1.035 : 1 : 0.559
Unit Cell Volume:V 430.79 ų (Calculated from Unit Cell)

Optical Data of Clinoferrosilite

Type:Biaxial (+)
RI values: nα = 1.764 nβ = 1.767 nγ = 1.792
2V:Measured: 25° , Calculated: 40°
Maximum Birefringence:δ = 0.028

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:very strong

Chemical Properties of Clinoferrosilite

Formula:
Fe
2+
 
(Fe
2+
 
,Mg)[Si
 
2
O
 
6
]
Essential elements:Fe, O, Si
All elements listed in formula:Fe, Mg, O, Si

Relationship of Clinoferrosilite to other Species

Related to:
  • Clinopyroxene Subgroup
    • Related Minerals - Nickel-Strunz Grouping):

    - +
    9.DA.05Donpeacorite
    (Mn
    2+
     
    		,Mg)Mg[SiO
     
    3
    		]
     
    2
    9.DA.05Enstatite
    Mg
     
    2
    		[SiO
     
    3
    		]
     
    2
    9.DA.05Ferrosilite
    Fe
     
    2
    		[SiO
     
    3
    		]
     
    2
    9.DA.10Clinoenstatite
    Mg
     
    2
    		[Si
     
    2
    		O
     
    6
    		]
    9.DA.10Kanoite
    Mn
    2+
     
    		(Mg,Mn
    2+
     
    		)[Si
     
    2
    		O
     
    6
    		]
    9.DA.10Pigeonite
    (Mg,Fe
    2+
     
    		,Ca)(Mg,Fe
    2+
     
    		)[Si
     
    2
    		O
     
    6
    		]
    9.DA.15Augite
    (Ca,Na)(Mg,Fe
    2+
     
    		,Al,Fe
    3+
     
    		,Ti)[(Si,Al)
     
    2
    		O
     
    6
    		]
    9.DA.15Diopside
    CaMg[Si
     
    2
    		O
     
    6
    		]
    9.DA.15Esseneite
    CaFe
    3+
     
    		[AlSiO
     
    6
    		]
    9.DA.15Hedenbergite
    CaFe
    2+
     
    		[Si
     
    2
    		O
     
    6
    		]
    9.DA.15Johannsenite
    CaMn
    2+
     
    		[Si
     
    2
    		O
     
    6
    		]
    9.DA.15Petedunnite
    Ca(Zn,Mn
    2+
     
    		,Mg,Fe
    2+
     
    		)[Si
     
    2
    		O
     
    6
    		]
    9.DA.15Davisite
    CaScAlSiO
     
    6
    9.DA.15IMA2008-059
    CaAl[AlSiO
     
    6
    		]
    9.DA.15IMA2008-042a
    CaTi
    3+
     
    		 AlSiO
     
    6
    9.DA.20Aegirine-augite
    (Na,Ca)(Fe
    3+
     
    		,Fe
    2+
     
    		,Mg,Al)Si
     
    2
    		O
     
    6
    9.DA.20Omphacite
    (Ca,Na)(Mg,Al)[Si
     
    2
    		O
     
    6
    		]
    9.DA.25Aegirine
    NaFe
    3+
     
    		[Si
     
    2
    		O
     
    6
    		]
    9.DA.25Jadeite
    Na(Al,Fe
    3+
     
    		)[Si
     
    2
    		O
     
    6
    		]
    9.DA.25Jervisite
    (Na,Ca,Fe
    2+
     
    		)(Sc,Mg,Fe
    2+
     
    		)[Si
     
    2
    		O
     
    6
    		]
    9.DA.25Kosmochlor
    NaCr[Si
     
    2
    		O
     
    6
    		]
    9.DA.25Namansilite
    NaMn
    3+
     
    		[Si
     
    2
    		O
     
    6
    		]
    9.DA.25Natalyite
    Na(V
    3+
     
    		,Cr)[Si
     
    2
    		O
     
    6
    		]
    9.DA.30Spodumene
    LiAl[Si
     
    2
    		O
     
    6
    		]
    Related Minerals - Hey's Index Grouping:

    - +
    14.21.1Olivine
    (Mg,Fe
    2+
     
    		)
     
    2
    		[SiO
     
    4
    		]
    14.21.2Ringwoodite
    (Mg,Fe
    2+
     
    		)
     
    2
    		[SiO
     
    4
    		]
    14.21.3Wadsleyite
    (Mg,Fe
    2+
     
    		)
     
    2
    		[SiO
     
    4
    		]
    14.21.5Anthophyllite
    ☐[Mg
     
    2
    		][Mg
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    14.21.6Cummingtonite
    [ ][Mg
     
    2
    		][Mg
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    14.21.7 Magnesiocummingtonite
    14.21.8Grunerite
    [ ][Fe
    2+
    2
    		][Fe
    2+
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    14.21.9Minnesotaite
    (Fe,Mg)
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    14.21.10Chesterite
    (Mg,Fe)
     
    17
    		Si
     
    20
    		O
     
    54
    		(OH)
     
    6
    14.21.11Jimthompsonite
    (Mg,Fe)
     
    5
    		Si
     
    6
    		O
     
    16
    		(OH)
     
    2
    14.21.12Clinojimthompsonite
    (Mg,Fe)
     
    5
    		Si
     
    6
    		O
     
    16
    		(OH)
     
    2
    14.21.13Majorite
    Mg
     
    3
    		(Fe
    2+
     
    		,Si,Al)
     
    2
    		[SiO
     
    4
    		]
     
    3
    14.21.14Balangeroite
    (Mg,Fe,Fe,Mn)
     
    42
    		Si
     
    16
    		O
     
    54
    		(OH)
     
    40

    Other Names for Clinoferrosilite

    Other Languages:
    German:Clinoferrosilit
    Klinoferrosilit
    Russian:Клиноферросилит
    Spanish:Clinoferrosilita

    Other Information

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

    References for Clinoferrosilite

    Reference List:American Mineralogist (1936): 21: 678.

    Clark, J.R., D.E. Appleman, and J.J. Papike (1969) Crystal-chemical characterization of clinopyroxenes based on eight new structure refinements. MSA Special Paper 2: 31-50.

    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 Clinoferrosilite

    Search Engines:
  • Look for Clinoferrosilite on Google
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    • External Links:
  • Look for Clinoferrosilite on Webmineral
  • Look for Clinoferrosilite on Athena Mineralogy
  • Look for Clinoferrosilite on Wikipedia
  • Look for Clinoferrosilite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Clinoferrosilite in the Natural History Museum (London) online catalogue
  • Clinoferrosilite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Fabre Minerals - search for Clinoferrosilite specimens
  • Rare and Unusual minerals at Mineralogical Research Company
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  • Wright's Rock Shop - excellent mineral specimens since 1970
  • Search for Clinoferrosilite on minvision.com
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    Localities for Clinoferrosilite

    Hide Locality List
    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • New South Wales
      • Yancowinna Co.
    		Birch BH Book
    Brazil
     
    • Southeast Region
      • Minas Gerais
    		Jour. of South American Earth Sci. 15:709–723
    Germany
     
    • Rhineland-Palatinate
      • Eifel Mts
        • Mayen
          • Ettringen
            • Bellerberg volcano
    		Blass, G., Graf, H.W., Kolitsch, U., Neue Funde aus der Vulkaneifel - ein Rückblick auf die Sammelsaison 2002, Mineralien-Welt 13/5, 2003
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Okayama Prefecture
          • Takahashi
    		Matsueda, H. (1980) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 5, #4, 15-77.; Matsueda, H. (1980) Journal of the Mining College, Akita University, Ser. A, Mining Geology, 5, #4, 15-77.
    Kenya
     
    • Rift Valley Province
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
    		[World of Stones 12:49]
    South Africa
     
    • Free State Province
      • Vredefort
    		Minerals of South Africa
    USA
     
    • California
      • Inyo Co.
        • Coso Hot Springs
    		www.mineralsocal.org/scfm/california/i.htm.
    • Wyoming
      • Park Co.
        • Yellowstone National Park
    		Amer.J.Sci.(1935) ser. 4, 30, 481-494
    Mineral and/or Locality
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