Davisite, CaScAlSiO6, a new pyroxene from the Allende meteorite
نویسندگان
چکیده
منابع مشابه
Grossmanite, CaTi3+AlSiO6, a new pyroxene from the Allende meteorite
Grossmanite, Ca(Ti,Mg,Ti)AlSiO6 with an end-member formula CaTiAlSiO6, is a new member of the Ca clinopyroxene group, where the trivalent cations are dominant in the M1 site with Ti3+ being the dominant trivalent cation. It occurs as micrometer-sized crystals along with spinel and perovskite in a melilite host in Ca-,Al-rich refractory inclusions from the Allende meteorite. The mean chemical co...
متن کاملTistarite, Ti2O3, a new refractory mineral from the Allende meteorite
Tistarite, ideally Ti2O3, is a new member of the corundum-hematite group. It is found as one subhedral crystal in a cluster of micrometer-sized refractory grains along with khamrabaevite (TiC), rutile, and corundum crystals within a chondrule from the Allende meteorite. The mean chemical composition determined by electron microprobe analysis is (wt%) Ti2O3 94.94, MgO 2.06, Al2O3 1.50, ZrO2 0.44...
متن کاملHibonite-(Fe), (Fe,Mg)Al12O19, a new alteration mineral from the Allende meteorite
Hibonite-(Fe), (Fe,Mg)Al12O19, is the Fe2+-dominant analog of hibonite CaAl12O19, discovered in a highly altered Ca-,Al-rich refractory inclusion from the Allende meteorite. It occurs as scattered micrometer-sized single crystals within an aggregate of hercynite (Fe,Mg)Al2O4, adjacent to nepheline, ilmenite, ferroan spinel, perovskite, and hibonite. The mean chemical composition determined by e...
متن کاملS Systematics of Wadalite from the Allende Meteorite
Introduction: The origin of short-lived radionuclides in the early Solar System is currently the subject of considerable debate. Their ultimate nucleosynthetic sources [c.f. 1-4] have important implications regarding the usability of these nuclides as high-resolution chronometers for dating early Solar System events. If these radionuclides originated from a nearby exploding star(s) and were wel...
متن کاملCalcium Isotopic Anomalies in the Allende Meteorite
We report isotopic anomalies inCa which were found in two Ca-Al-rich inclusions of the Allende meteorite. These inclusions previously had been shown to contain special anomalies for Mg and 0 which were attributed to fractionation and unknown nuclear effects. The Ca data when corrected for mass fractionation by using 4°Ca; 44Ca as a standard show nonlinear isotopic ~ffects in 48Ca of + 13.5 per ...
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ژورنال
عنوان ژورنال: American Mineralogist
سال: 2009
ISSN: 0003-004X
DOI: 10.2138/am.2009.3209