This chapter of the Deep Rock Galactic guide has all the information about the Hollomite mineral - where to find it, how to identify, and what it can be used for.
Hollomite is one of the minerals found in Deep Rock Galactic. It has a dark orange color with patches of dark purple crystals. Hollomite is one of the resources collected during side tasks.
Hollomite can be found throughout the planetary system but will appear in caves only when it is a part of a side task. Hollomite is a durable mineral so you have to hit it twice to rip off a piece of the deposit.