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Clinoferrosilite

Big Photo

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 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.05Akimotoite
(Mg,Fe
2+
 
)SiO
 
3
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.20Aegirine-augite
(Na,Ca)(Fe,Fe,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

German names:
ClinoferrosilitKlinoferrosilit
Russian names:
Клиноферросилит
Spanish names:
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

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  • 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)
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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
    		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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