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NWA 7811 est une fraîche météorite classée eucrite polymict breccia de seulement 95 grammes.
Elle a été découverte en 2011 et classifiée par Anthony Irving en 2012.
Les eucrites proviennent de l’Astéroïde Vesta.
Petrography: (A. Irving and S. Kuehner, UWS) Fresh fragmental breccia composed mainly of crystal debris from several different basaltic eucrite and gabbroic eucrite protoliths (with some polymineralic clasts of same), plus sparse clasts of diogenite and diogenitic orthopyroxene. Minerals include exsolved pigeonite, orthopyroxene, clinopyroxene, calcic plagioclase, silica polymorph, ilmenite, troilite, chromite, and fayalite.
Geochemistry: Diogenitic orthopyroxene (Fs24.1Wo1.5; FeO/MnO = 34), orthopyroxene (Fs49.9Wo2.5; FeO/MnO = 31), clinopyroxene (Fs20.8-25.8Wo45.1-44.6; FeO/MnO = 32-35), host orthopyroxene (Fs61.6Wo1.8; FeO/MnO = 34), clinopyroxene exsolution lamellae (Fs21.6Wo43.8; FeO/MnO = 34), olivine (Fa92.7).
NWA 7811 est une fraîche météorite classée eucrite polymict breccia de seulement 95 grammes.
Elle a été découverte en 2011 et classifiée par Anthony Irving en 2012.
Les eucrites proviennent de l’Astéroïde Vesta.
Petrography: (A. Irving and S. Kuehner, UWS) Fresh fragmental breccia composed mainly of crystal debris from several different basaltic eucrite and gabbroic eucrite protoliths (with some polymineralic clasts of same), plus sparse clasts of diogenite and diogenitic orthopyroxene. Minerals include exsolved pigeonite, orthopyroxene, clinopyroxene, calcic plagioclase, silica polymorph, ilmenite, troilite, chromite, and fayalite.
Geochemistry: Diogenitic orthopyroxene (Fs24.1Wo1.5; FeO/MnO = 34), orthopyroxene (Fs49.9Wo2.5; FeO/MnO = 31), clinopyroxene (Fs20.8-25.8Wo45.1-44.6; FeO/MnO = 32-35), host orthopyroxene (Fs61.6Wo1.8; FeO/MnO = 34), clinopyroxene exsolution lamellae (Fs21.6Wo43.8; FeO/MnO = 34), olivine (Fa92.7).
NWA 7811 est une fraîche météorite classée eucrite polymict breccia de seulement 95 grammes.
Elle a été découverte en 2011 et classifiée par Anthony Irving en 2012.
Les eucrites proviennent de l’Astéroïde Vesta.
Petrography: (A. Irving and S. Kuehner, UWS) Fresh fragmental breccia composed mainly of crystal debris from several different basaltic eucrite and gabbroic eucrite protoliths (with some polymineralic clasts of same), plus sparse clasts of diogenite and diogenitic orthopyroxene. Minerals include exsolved pigeonite, orthopyroxene, clinopyroxene, calcic plagioclase, silica polymorph, ilmenite, troilite, chromite, and fayalite.
Geochemistry: Diogenitic orthopyroxene (Fs24.1Wo1.5; FeO/MnO = 34), orthopyroxene (Fs49.9Wo2.5; FeO/MnO = 31), clinopyroxene (Fs20.8-25.8Wo45.1-44.6; FeO/MnO = 32-35), host orthopyroxene (Fs61.6Wo1.8; FeO/MnO = 34), clinopyroxene exsolution lamellae (Fs21.6Wo43.8; FeO/MnO = 34), olivine (Fa92.7).
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NWA 7811 est une fraîche météorite classée eucrite polymict breccia de seulement 95 grammes.
Elle a été découverte en 2011 et classifiée par Anthony Irving en 2012.
Les eucrites proviennent de l’Astéroïde Vesta.
Petrography: (A. Irving and S. Kuehner, UWS) Fresh fragmental breccia composed mainly of crystal debris from several different basaltic eucrite and gabbroic eucrite protoliths (with some polymineralic clasts of same), plus sparse clasts of diogenite and diogenitic orthopyroxene. Minerals include exsolved pigeonite, orthopyroxene, clinopyroxene, calcic plagioclase, silica polymorph, ilmenite, troilite, chromite, and fayalite.
Geochemistry: Diogenitic orthopyroxene (Fs24.1Wo1.5; FeO/MnO = 34), orthopyroxene (Fs49.9Wo2.5; FeO/MnO = 31), clinopyroxene (Fs20.8-25.8Wo45.1-44.6; FeO/MnO = 32-35), host orthopyroxene (Fs61.6Wo1.8; FeO/MnO = 34), clinopyroxene exsolution lamellae (Fs21.6Wo43.8; FeO/MnO = 34), olivine (Fa92.7).
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Zagora 003 est une fraîche météorite classée eucrite de seulement 135 grammes.
Elle a été découverte près de Zagora au Maroc par Ahmed Enaji le 13 septembre 2020.
Les eucrites proviennent de l’Astéroïde Vesta.
Writeup from MB 110:
Zagora 003 30°20’51.94″N, 5°36’41.79″W
Morocco
Find: 2020 Sep 13
Classification: HED achondrite (Eucrite)
History: Found by Ahmed Enaji on September 13, 2020. Bought from Zaid Oualguirah in 2020.
Physical characteristics: Several fusion crusted pieces with grey interior.
Petrography: (J. Gattacceca, CEREGE) Igneous rock with grain size about 500 µm. It contains melt rock areas, and other areas with variolitic texture. Main minerals are pyroxene and plagioclase. Other minerals: metal, troilite, chromite.
Geochemistry: Low-Ca pyroxene Fs34.1±0.8Wo5.7±1.1, FeO/MnO = 28.6±2.4 (n=4). Plagioclase An93.3±0.6Ab6.4±0.6Or0.3±0.1 (n=5). Chromite Cr# = 0.78 (n=1).
Classification: Achondrite (eucrite).
Specimens: Type specimen at CEREGE. Main mass with Jean Redelsperger.