Here's why:

* Native elements are minerals that occur in their pure, uncombined form. Examples include gold (Au), silver (Ag), copper (Cu), and sulfur (S).

* Feldspar is a group of silicate minerals. They are composed of silicon, oxygen, aluminum, and various other elements like sodium, potassium, and calcium.

* Hematite is an iron oxide mineral. It consists of iron and oxygen, not pure iron.

Therefore, both feldspar and hematite are compound minerals, not native elements.