All content is accurate for 3.68 Frontiers, including upcoming content.
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Contents / Details Of POI:
They will yield one of the following resources when harvested:
Chlorine is found on scorched worlds.
Mordite is found on desert worlds.
Some have to be mined with the Mining Beam and some can be picked.
All planets of a system share the same node type (POI from the Fauna, Flora & Minerals Category); so only one of these will appear in each system (not including crop clusters).