Grossmanite, Davisite, and Kushiroite: Three Newly-approved Diopside-Group Clinopyroxenes in CAIs
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چکیده
منابع مشابه
KUSHIROITE, CaAl2SiO6, A NEW MINERAL IN CARBONACEOUS CHONDRITES: ITS FORMATION CONDITIONS AND GENETIC SIGNIFICANCE IN Ca-Al- RICH REFRACTORY INCLUSIONS
Introduction: Ca-Tschermak (hereafter CaTs), CaAl 2 SiO 6 , component has been one of the most important hypothetical members of pyroxene, and CaTs-rich pyroxene was abundantly reported from refractory inclusions in carbonaceous chondrites [e.g., 1]. However, the nature of such pyroxene has not been characterized in detail because of their tiny grain size. For the first time, we succeeded to id...
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Five clinopyroxenes containing various amounts of six-coordinated Si (VISi) in the Na(Mg0.5Si0.5) Si2O6 (NaPx)-NaAlSi2O6 (jadeite) system have been synthesized at 15 GPa and 1600 °C and their structures studied with single-crystal X-ray diffraction and Raman spectroscopy. The results show that clinopyroxenes with VISi ≤ 0.33 atoms per formula unit (apfu) possess C2/c symmetry, whereas those wit...
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Introduction: During a nanomineralogy investigation of the Allende CV3 meteorite, we discovered two new minerals, burnettite (IMA 2013054; CaVAlSiO6) and paqueite (IMA 2013-053; Ca3TiSi2(Al2Ti)O14), in a V-rich, fluffy Type A Ca-Alrich inclusion (CAI) A-WP1 (0.6 × 1 mm in size) in USNM 7617, which was previously studied by Paque and coworkers [1-3]. Electron probe microanalysis (EPMA), scanning...
متن کاملMineral chemistry of clinopyroxenes of basalts from south-west of Khoy, NW Iran: determination of tectonic environment and formation conditions of basaltic rocks
The exposed volcanic rocks in south west of the Khoy area consist of basalts with minor amounts of plagioclase-phyric basalts. These rocks are composed of clinopyroxene plus plagioclase and plagioclase phenocrysts, respectively. The basaltic rocks are highly altered and contains high amounts of secondary minerals mainly chlorite and epidote. According to mineral chemistry, the composition of cl...
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Introduction: During an ongoing nanomineralogy investigation of the Allende CV3 meteorite, a new mineral, Ni6(Sn,Ge)(S,Te)2, was identified in fractures in a Type B1 Ca-Al-rich refractory inclusion (CAI) ACM-2, named “butianite”. Synthetic Ni6SnS2 is well known [1]. Presented here is the first natural occurrence of Ni6SnS2, as a new alteration mineral in a CAI from a primitive meteorite. Field-...
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