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The first known natural occurrence of calcium monoaluminate, in a calcium‐aluminum‐rich inclusion from the CH chondrite Northwest Africa 470
Author(s) -
Ivanova Marina A.,
Petaev Michail I.,
Macpherson Glenn J.,
Nazarov Michail A.,
Taylor Lawrence A.,
Wood John A.
Publication year - 2002
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.2002.tb01032.x
Subject(s) - melilite , chondrite , calcium , inclusion (mineral) , geology , mineralogy , geochemistry , astrobiology , materials science , meteorite , metallurgy , spinel , physics , paleontology
— Natural calcium monoaluminate, CaAl 2 O 4 , has been found in a grossite‐rich calcium‐aluminum‐rich inclusion (CAI) from the CH chondrite Northwest Africa 470. The calcium monoaluminate occurs as colorless ∼10 μm subhedral grains intergrown with grossite, perovskite, and melilite. Nebular condensation is the most likely origin for the precursor materials of this CAI, but calculations suggest that dust/gas ratios substantially enhanced over solar are required to stabilize CaAl 2 O 4 .