Sial

Sial can be the upper layer of the Earth's crust
Felsic

Sial can also be:

Places
 Sial, Kapurthala, Punjab State, India
 Sial, Khyber Pakhtunkhwa, Pakistan
 Sial Sharif, a small village in Pakistan

Other uses
 Sial (tribe), a people of Pakistan
 siyal/sial/siala, a people in India