Discussion
Which one of the following is the earliest formed mineral condensate in the early solar system ?
Answer: A
The earliest-formed condensate among these is corundum.
As the hot solar nebula cooled, minerals condensed in order of decreasing condensation temperature. Calculations and calcium-aluminium-rich inclusions in meteorites show that refractory oxides of aluminium and calcium came first: corundum (Al\(_{2}\)O\(_{3}\)) at about 1700 K, followed by hibonite and perovskite, then melilite and spinel.
Forsterite and enstatite, the magnesium silicates, condense later at about 1400 K, and anorthite also forms below the refractory oxides, so none of them precedes corundum.
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