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- W2054653501 abstract "Dmisteinbergite, CaAl2Si2O8 with P63/mcm structure, was identified in a rounded coarse-grained igneous Type B2 Ca-,Al-rich inclusion (CAI) STP-1 from the Allende CV3 carbonaceous chondrite. STP-1 belongs to a very rare type of refractory inclusions, Fractionation and Unknown Nuclear effects (FUN) CAIs, which experienced melt evaporation and crystallization at low total gas pressure (P < 10-6 bar) in a high-temperature (>1200 °C) region, possibly near the proto-Sun and were subsequently radially transported away from region, possibly by a disk wind. The Allende dmisteinbergite occurs as irregular single crystals (100-600 mm in size) in contact with gehlenitic melilite and Al,Ti-diopside, poikilitically enclosing euhedral spinel, and rare anorthite. It is colorless and transparent. The mean chemical composition, determined by electron microprobe analysis, is (wt%) SiO2 42.6, Al2O3 36.9, CaO 20.2, MgO 0.05, sum 99.75, giving rise to an empirical formula of Ca1.01Al1.96Si2.02O8. Its electron backscatter diffraction patterns are a good match to that of synthetic CaAl2Si2O8 with the P63/mcm structure and the unit cell a = 5.10 Å, c = 14.72 Å, and Z = 2. Dmisteinbergite could have crystallized from a silicate melt at high temperature (~1200-1400 °C) via rapid cooling. Dmisteinbergite in Allende, the first find in a meteorite, is a new member of refractory silicates, among the first solid materials formed in the solar nebula" @default.
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- W2054653501 date "2013-07-01" @default.
- W2054653501 modified "2023-10-18" @default.
- W2054653501 title "Discovery of dmisteinbergite (hexagonal CaAl2Si2O8) in the Allende meteorite: A new member of refractory silicates formed in the solar nebula" @default.
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- W2054653501 doi "https://doi.org/10.2138/am.2013.4496" @default.
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