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Pale yellow, ...
4½ - 5½
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:
Isostructural with:

Classification of Pyroxferroite


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

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
6 : Single-Width Unbranched Chains, W=1 with chains P=7

14 : Silicates not Containing Aluminum
22 : Silicates of Fe and Ca URL:
Please feel free to link to this page.

Type Occurrence of Pyroxferroite

Year of Discovery:

Physical Properties of Pyroxferroite

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

Crystallography of Pyroxferroite

Crystal System:
Cell Parameters:
a = 6.62Å, b = 7.55Å, c = 17.38Å
α = 144.26°, β = 82.68°, γ = 94.75°
a:b:c = 0.877 : 1 : 2.302

Optical Data of Pyroxferroite

Biaxial (+)
RI values:
nα = 1.746 - 1.756 nβ = 1.750 - 1.758 nγ = 1.764 - 1.768
Measured: 30° to 40°, Calculated: 50° to 58°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r < v marked

Chemical Properties of Pyroxferroite

All elements listed in formula:
Common Impurities:

Relationship of Pyroxferroite to other Species

Forms a series with Pyroxmangite (see here)
14.22.3 Ferro-akermaniteCa2FeSi2O7
14.22.8Julgoldite-(Fe2+)Ca2(Fe2+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2 · H2O

Other Names for Pyroxferroite

Name in Other Languages:
Simplified Chinese:三斜铁辉石

Other Information

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 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

The following Pyroxferroite specimens are currently listed for sale on

Localities for Pyroxferroite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
  • Eastern Antarctica
    • Victoria Land
      • Elephant Morraine
McSween Jr., HY & Treiman, AH (1998) Martian Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 6: 1-53: Mineralogical Society of America, Washington, DC, USA.
McSween Jr., H.Y. & Treiman, A.H. (1998) Martian Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 6: 1-53: Mineralogical Society of America, Washington, DC, USA.; Aramovich, C. J., Herd, C. D. K. & Papike, J. J. (2001) Possible Causes for Late-Stage Reaction Textures Associated with Pyroxferroite and Metastable Pyroxenes in the Basaltic Martian Meteorites (abstract): 32nd Annual Lunar and Planetary Science Conference, abstract#1003. (Mar 2001)
  • 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.
  • 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]
  • 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)
  • Dhofar Governorate (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.
  • Maramureș Co.; 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
  • Dalarna
    • Smedjebacken
Holtstam, D. (2001): Pyroxferroit, ett månmineral från Väster Silvberg, Dalarna. Litiofilen. 18(2), 23-25
The Moon (TL)
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.
  • 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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