Hematite

Hematite is a natural resource in Astroneer. Hematite is made of reddish-black, crystalline spikes.

Source
Hematite can be found on the following planets:

The gives 2 Hematite for every 3, up to 4 total for 6.

Uses
Hematite is used to craft the following items:

Media
Hematite Hématite Гематит 赤铁矿