It is thought to be a contact mineral formed at high pressure on the interface between volcanic rocks and limestone.
Oxygen Reservoirs in the Early Solar Nebula Inferred from an Allende CAI.(analysis of calcium-aluminum-rich inclusion from Allende meteorite)(Abstract)
Oct 16, 1998; Nearly one-third of condensed matter in the inner solar system is composed of oxygen (1). Variability in [sup.17]O/[sup.16]O and...