IMA 2014-028 = adrianite

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Marco E. Ciriotti
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IMA 2014-028 = adrianite

Messaggio da Marco E. Ciriotti » sab 23 ago, 2014 14:50

IMA 2014-028, adrianite, Ca12(Mg5Si9)O32Cl6, from Allende meteorite. Si-analogue of wadalite.

http://www.its.caltech.edu/~chima/
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2014-028 = adrianite

Messaggio da Marco E. Ciriotti » ven 11 mag, 2018 9:39

Prossima pubblicazione.

Referenza:
▪ Ma, C. & Krot, A.N. (2018): Adrianite, Ca12(Al4Mg3Si7)O32Cl6, a new Cl-rich silicate mineral from the Allende meteorite: An alteration phase in a Ca-Al-rich inclusion. American Mineralogist, 103, (in press).

NdR: la formula, rispetto al proposal iniziale, è dunque modificata in Ca12(Mg3Al4Si3)Si4O32Cl6.

Permangono dubbi: 60% Ca12(Mg5Si9)O32Cl6 (theorical Mg-endmember) + 40% Ca12(Al10Si4)O32Cl6 (wadalite).

Adrianite Ca12(Mg3Al4Si3)Si4O32Cl6
Eltyubyuite Ca12Fe3+10Si4O32Cl6
Wadalite Ca12Al10Si4O32Cl6
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2014-028 = adrianite

Messaggio da Marco E. Ciriotti » gio 02 ago, 2018 11:54

Pubblicazione effettuata.

Referenza:
▪ Ma, C. & Krot, A.N. (2018): Adrianite, Ca12(Al4Mg3Si7)O32Cl6, a new Cl-rich silicate mineral from the Allende meteorite: An alteration phase in a Ca-Al-rich inclusion. American Mineralogist, 103, 1329-1334.

Abstract:
Adrianite (IMA 2014-028), Ca12(Al4Mg3Si7)O32Cl6, is a new Cl-rich silicate mineral and the Si,Mg analog of wadalite. It occurs with monticellite, grossular, wadalite, and hutcheonite in altered areas along some veins between primary melilite, spinel, and Ti,Al-diopside in a Type B1 FUN (Fractionation and Unidentified Nuclear effects) Ca-Al-rich inclusion (CAI), Egg-3, from the Allende CV3 carbonaceous chondrite. The mean chemical composition of type adrianite by electron probe microanalysis is (wt%) CaO 41.5, SiO2 27.5, Al2O3 12.4, MgO 7.3, Na2O 0.41, Cl 13.0, O=Cl –2.94, total 99.2, giving rise to an empirical formula of (Ca11.69Na0.21)(Al3.85Mg2.88Si7.23)O32Cl5.80. The end-member formula is Ca12(Mg5Si9)O32Cl6. Adrianite has the I43d wadalite structure with a = 11.981 Å, V = 1719.8 Å3, and Z = 2, as revealed by electron backscatter diffraction. The calculated density using the measured composition is 3.03 g/cm3. Adrianite is a new secondary mineral in Allende, apparently formed by alkali-halogen metasomatic alteration of primary CAI minerals such as melilite, anorthite, perovskite, and Ti,Al-diopside on the CV chondrite parent asteroid. Formation of secondary Cl-rich minerals sodalite, adrianite, and wadalite during metasomatic alteration of the Allende CAIs suggests that the metasomatic fluids had Cl-rich compositions. The mineral name is in honor of Adrian J. Brearley, mineralogist at the University of New Mexico, U.S.A., in recognition of his many contributions to the understanding of secondary mineralization in chondritic meteorites.
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