Wolframite

Wolframite is a rare resource in Astroneer. However despite its rarity it can be found more commonly on the barren planet in deep caves and on the surface. Wolframite is a yellowish ore shaped like many cubes in each other, similar to real-world bismuth.

Source
Wolframite can be found on the following planets:

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

Media
Вольфрамит Wolframite