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Pyroxene Group

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Named in 1796 by Rene Just Haüy from the Greek words for fire (πυρ) and stranger (ξένος). Pyroxene was named because of its presence in a glassy or vitreous lava. Pyroxene was believed to be an impurity in the glass, and therefore a "stranger to fire" and not formed by the action of heat. Pyroxene was originally what might now be called "augite", but the name has been raised as a group name of structurally and chemically similar minerals.
A large group of inosilicate (chain silicate) minerals with the general formula ABSi2O6.
It is divided into the Clinopyroxene Subgroup (monoclinic) and the Orthopyroxene Subgroup (orthorhombic).

The most recent nomenclature is given by Morimoto (1988, 1989).

Classification of Pyroxene Group

Relationship of Pyroxene Group to other Species

Group Members:
Clinopyroxene Subgroup 
  Aegirine NaFe3+Si2O6
  Aegirine-augite (Na,Ca)(Fe3+,Fe2+,Mg,Al)Si2O6
  Augite (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
  Clinoenstatite MgSiO3
  Clinoferrosilite Fe2+SiO3
  Diopside CaMgSi2O6
  Esseneite CaFe3+[AlSiO6]
  Hedenbergite CaFe2+Si2O6
  Jadeite Na(Al,Fe3+)Si2O6
  Jervisite (Na,Ca,Fe2+)(Sc,Mg,Fe2+)Si2O6
  Johannsenite CaMn2+Si2O6
  Kanoite Mn2+(Mg,Mn2+)Si2O6
  Kosmochlor NaCrSi2O6
  Kushiroite CaAl[AlSiO6]
  Namansilite NaMn3+Si2O6
  Natalyite NaV3+Si2O6
  Omphacite (Ca,Na)(Mg,Al)Si2O6
  Petedunnite Ca(Zn,Mn2+,Mg,Fe2+)Si2O6
  Pigeonite (Mg,Fe2+,Ca)(Mg,Fe2+)Si2O6
  Spodumene LiAlSi2O6
Orthopyroxene Subgroup 
  Donpeacorite (Mn2+,Mg)Mg[SiO3]2
  Enstatite MgSiO3
  Ferrosilite FeSiO3

Other Names for Pyroxene Group

Name in Other Languages:
Simplified Chinese:辉石族

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.

Pyroxene Group in petrology

An essential component of (items highlighted in red)
Common component of (items highlighted in red)
Accessory component of (items highlighted in red)

References for Pyroxene Group

Reference List:
Wyckoff, R.W.G., Merwin, H.E., Washington, H.S. (1925) X-ray diffraction measurements upon the pyroxenes. American Journal of Science, 5th. Series: 10: 383-397.

Edgar, A.D., Mottana, A., MacRae, N.D. (1969) The chemistry and cell parameters of omphacite and related pyroxenes. Mineralogical Magazine: 37: 61-74.

Fleet, M.E. (1974) Mg,Fe 2+ site occupancies in coexisting pyroxenes. Contributions to Mineralogy and Petrology: 47: 207-214.

Reid, A.M., Brown, R.W., Dawson, J.B., Whitfield, G.G., Siebert, J.C. (1976) Garnet and pyroxene compositions in some diamondiferous eclogites. Contributions to Mineralogy and Petrology: 58: 203-220.

Arndt, N.T., Fleet, M.E. (1979) Stable and metastable pyroxene crystallization in layered komatiite lava flows. American Mineralogist: 64: 856-864.

Cameron, M., Papike, J.J. (1981) Structural and chemical variations in pyroxenes. American Mineralogist: 66: 1-50.

Watanabe, S., Kitamura, M., Morimoto, N. (1985) A transmission electron microscope study of pyroxene chondrules in equilibrated L-group chondrites. Earth and Planetary Science Letters: 72: 87-98.

Morimoto, N., Fabries, J., Ferguson, A.K., Ginzburg, I.V., Ross, M., Seifert, F.A., Zussman, J., Aoki, K., Gottardi, G. (1988) Nomenclature of Pyroxenes. American Mineralogist: 73: 1123-1133.

Morimoto, N. (1989) Nomenclature of pyroxenes. The Canadian Mineralogist: 27: 143-156.

Brizi, E., Mellini, M. (1992) Kinetical modelling of exsolution textures in igneous pyroxenes. Acta Vulcanologica: 2: 87-93.

Bell, D.R., Ihinger, P.D., Rossman, G.R. (1995) Quantitative analysis of trace OH in garnet and pyroxenes. American Mineralogist: 80: 465-474.

Wodland, A.B. (1998) The orthorhombic to high-P monoclinic phase transition in Mg-Fe pyroxenes. Can it produce a seismic discontinuity? Geophysical Research Letters: 25: 1241-1244.

Papike, J.J., Karner, J.M., Shearer, C.K. (2005) Comparative planetary mineralogy: Valence-state partitioning of Cr, Fe, Ti and V among crystallographic sites in olivine, pyroxene, and spinel from planetary basalts. American Mineralogist: 90: 277-290.

Nespolo, M. & Aroyo, M.I. (2016): The modular structure of pyroxenes. European Journal of Mineralogy, 28, 189-203.

Hawthorne, F.C. (2016): Short-range atomic arrangements in minerals. I: The minerals of the amphibole, tourmaline and pyroxene supergroups. Eur. J. Mineral. 28, 513-536.

Internet Links for Pyroxene Group URL:
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Localities for Pyroxene Group

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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