Hematite

Hematite is a common Resource in Astroneer. It is mined from reddish-black spiky crystalline deposits and can be refined in the Smelting Furnace to produce Iron.

Glacio is the easiest planet on which to find Hematite.

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