What materials condensed into solid grains in the hot inner regions closest to the nascent Sun?

Answer

Metals and silicate minerals

Due to the high temperatures in the hot inner regions, only materials possessing high melting points, primarily metals and silicate minerals (rock), could condense into solid grains.

What materials condensed into solid grains in the hot inner regions closest to the nascent Sun?
solar systemformationhypothesiscreation