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Pyroxferroite

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Formula:
(Fe,Mn,Ca)SiO
 
3
System:TriclinicColour:Pale yellow, ...
Hardness:4½ - 5½
Name:Named in 1970 by Edward Ching-Te Chao, Jean A. Minkin, Clifford Frondel, Cornelius Klein, Jr., John C. Drake, Louis H. Fuchs, B. Tani, Joseph V. Smith, A. T. Anderson, Paul B. Moore, G. R. Zechman, Jr., Robert James Traill, A. G. Plant, J. A. V. Douglas, and Michael R. Dence for the mineral's iron-rich relationship to pyroxmangite.
Dimorph of:Pyroxene Group
Isostructural with:Pyroxmangite

Classification of Pyroxferroite

IMA status:Approved
Strunz 8th edition ID:8/F.31-10
Nickel-Strunz 10th (pending) edition ID:9.DO.05

9 : SILICATES (Germanates)
D : Inosilicates
O : Inosilicates with 7-, 8-, 10-, 12- and 14-periodic chains
Dana 8th edition ID:65.6.1.2

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
6 : Single-Width Unbranched Chains, W=1 with chains P=7
Hey's CIM Ref.:14.22.2

14 : Silicates not Containing Aluminum
22 : Silicates of Fe and Ca
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Type Occurrence of Pyroxferroite

Type Locality:Mare Tranquillitatis (Sea of Tranquility), The Moon
Year of Discovery:1970

Physical Properties of Pyroxferroite

Colour:Pale yellow, orange-yellow, yellow, light brown
Hardness (Mohs):4½ - 5½

Crystallography of Pyroxferroite

Crystal System:Triclinic
Cell Parameters:a = 6.62Å, b = 7.55Å, c = 17.38Å
α = 144.26°, β = 82.68°, γ = 94.75°
Ratio:a:b:c = 0.877 : 1 : 2.302
Unit Cell Volume:V 502.94 ų (Calculated from Unit Cell)

Optical Data of Pyroxferroite

Type:Biaxial (+)
RI values: nα = 1.746 - 1.756 nβ = 1.750 - 1.758 nγ = 1.764 - 1.768
2V:Measured: 30° to 40°, Calculated: 50° to 58°
Maximum Birefringence:δ = 0.018

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

Chemical Properties of Pyroxferroite

Formula:
(Fe,Mn,Ca)SiO
 
3
Simplified for copy/paste:(Fe,Mn,Ca)SiO3
Essential elements:Fe, O, Si
All elements listed in formula:Ca, Fe, Mn, O, Si
Common Impurities:Ti,Al,Mg,Na

Relationship of Pyroxferroite to other Species

Series:Forms a series with Pyroxmangite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
9.DO.05Pyroxmangite
MnSiO
 
3
9.DO.10Pellyite
Ba
 
2
Ca(Fe,Mg)
 
2
Si
 
6
O
 
17
9.DO.15Nordite-(Ce)
(Ce,La)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
9.DO.15Nordite-(La)
(La,Ce)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
9.DO.15Ferronordite-(Ce)
Na
 
3
SrCeFe
2+
 
Si
 
6
O
 
17
9.DO.15Manganonordite-(Ce)
Na
 
3
SrCeMn
2+
 
Si
 
6
O
 
17
9.DO.15Ferronordite-(La)
Na
 
3
Sr(La,Ce)FeSi
 
6
O
 
17
9.DO.20Alamosite
Pb
 
12
[Si
 
12
O
 
36
]
9.DO.25Liebauite
Ca
 
3
Cu
 
5
Si
 
9
O
 
26
Related Minerals - Hey's Index Grouping:

- +
14.22.1Hedenbergite
CaFe
2+
 
Si
 
2
O
 
6
14.22.3 Ferro-akermanite
Ca
 
2
FeSi
 
2
O
 
7
14.22.4Kirschsteinite
CaFe
2+
 
SiO
 
4
14.22.5Tungusite
Ca
 
4
Fe
 
2
Si
 
6
O
 
15
(OH)
 
6
14.22.6Ferro-actinolite
☐{Ca
 
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.22.7Ilvaite
CaFe
2+
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
14.22.8Julgoldite-(Fe2+)
Ca
 
2
(Fe
2+
 
,Mg)(Fe
3+
 
,Al)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
· H
 
2
O
14.22.9Andradite
Ca
 
3
Fe
3+
2
(SiO
 
4
)
 
3

Other Names for Pyroxferroite

Synonyms:
IMA1970-001
Other Languages:
German:Pyroxferroit
Simplified Chinese:三斜铁辉石
Spanish:Piroxferroita

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 Pyroxferroite

Reference List:

- +
Edward Ching-Te Chao, J. A. Minkin, Clifford Frondel, Cornelius Klein, Jr., J. C. Drake, L. Fuchs, B. Tani, Joseph V. Smith, A. T. Anderson, Paul B. Moore, G. R. Zechman, Jr., R. J, Traill, A. G. Plant, J. A. V. Douglas, and M. R. Dence (1970) American Mineralogist: 55: 2137.

Geochemica et Cosmochimica Acta: 34(1): 65-79.

Burnham, C. (1971) The crystal structure of pyroxferroite from Mare Tranquilitatis. Supplement to Geochemica et Cosmochimica Acta: 34(2): 47-57.

Nikischer, Tony and Joe Orosz (2007) Lunar Mineral Found at Franklin, Sussex Co., New Jersey. Mineral News: 23(8): 1, 2, 9, 14.

Internet Links for Pyroxferroite

Search Engines:
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  • External Links:
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  • Look for Pyroxferroite on Wikipedia
  • Look for Pyroxferroite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Pyroxferroite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Pyroxferroite specimens for sale - minfind.com
  • Localities for Pyroxferroite

    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.
    (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.
    Finland
     
    • Western and Inner Finland Region
      • Lapua
    Bulletin de la Commission Geologique de Finlande 115; 387-400, 1936
      • Seinäjoki
    Mancini, F., Alviola, R., Marshall, B., Satoh, H., & Papunen, H. (2000). The manganese silicate rocks of the early Proterozoic Vittinki group, southwestern Finland: Metamorphic grade and genetic interpretations. The Canadian Mineralogist, 38(5), 1103-1124.
    Heikkilä, Pasi 2003. Vittinki-ryhmän metaserttien geologia ja mineralogia Etelä-Pohjanmaalla. Pro gradu, matemaattis-luonnontieteellinen tiedekunta, Geologian laitos. Helsingin Yliopisto.
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Mayen
          • Ettringen
            • Bellerberg volcano
    [Blass, G., Graf, H.W., Neufunde von bekannten Fundorten (20), Mineralien-Welt 9/1, 45, 1998] [A. Wittern: Mineralfundorte in Deutschland, Schweizerbart (Stuttgart), 2001]
    Japan
     
    • Honshu Island
      • Kinki Region
        • Kyoto Prefecture
          • Kyotango City
    Masutomi Museum specimens (Kyoto)
    Yamada et al (1980), Chigaku Kenkyu: 31: 205-222.
          • Naka-gun
            • Mineyama-cho
    Alfredo Petrov - private communication (2008)
    Oman
     
    • Dhofar Province (Al Janubiyah Province)
    Taylor, L. A., Nazarov, M. A., Demidova, S. I., & Patchen, A. D. (2001). Dhofar 287: A new lunar mare basalt from Oman. Meteoritics and Planetary Science Supplement, 36, 204.
    Yukio, I., Makoto, K., Hiroshi, T., Gen, S., Kita, N., Yuichi, M., ... & Gerlind, D. (2006). Petrology of a new basaltic shergottite: Dhofar 378. Antarctic Meteorite Research, 19, 20-44.
    Romania
     
    • Maramureș Co.
    http://minerals-of-the-carpathians.eu; Hîrtopanu, P. (2006) One Hundred Minerals For One Hundred Years (dedicated To The Centennial Of The Geological Institute Of Romania) Acta Mineralogica-Petrographica, Abstract Series 5, Szeged, p38
    Sweden
     
    • Dalarna
      • Smedjebacken
    Holtstam, D. (2001): Pyroxferroit, ett månmineral från Väster Silvberg, Dalarna. Litiofilen. 18(2), 23-25
    The Moon
     
    Geochemica et Cosmochimica Acta: 34(1): 65-79
    • Taurus-Littrow Valley
    Longhi, J., Walker, D., Grove, T. L., Stolper, E. M., & Hays, J. F. (1974) The petrology of the Apollo 17 mare basalts. In: Lunar Science Conference, 5th, Houston, Tex., March 18-22, 1974, Proceedings. Volume 1. (A75-39540 19-91) New York, Pergamon Press, Inc., 1974, p. 447-469.
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Franklin
    Nikischer, Tony and Joe Orosz (2007) Lunar Mineral Found at Franklin, Sussex Co., New Jersey. Mineral News: 23(8): 1, 2, 9, 14.
    • South Carolina
      • Anderson Co.
    Nikischer, Tony and Joe Orosz (2007) Lunar Mineral Found at Franklin, Sussex Co., New Jersey. Mineral News: 23(8): 1, 2, 9, 14.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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