Titanite

Titanite is an rare resource in Astroneer. Veins of Titanite can be found on Vesania and Glacio planets. These veins generate inside rock that can only be mined with the Crane and Drill Head. However, parts of the vein can be mined with the Terrain Tool alone. In large quantities сan be found on Vesania on large hills covered with trees.(I found Only in that place)

Source
Titanite can be found on the following planets:

The gives 1 Titanite for every 2, up to 4 total for 8.

Media
Титанит