Planetary Resources
Planetary Resources in the Stellaris encyclopedia: Harvesting yields additional resources depending on the target Planet Class, scaling with the total size of all Harvestable Deposits.
Planetary Resources in the game's words
The encyclopedia entry as the game shows it in its tooltips; underlined words open their own entry or page here.
Harvesting yields additional resources depending on the target 
Planet Class, scaling with the total size of all Harvestable Deposits.
Unsurveyed targets or those without any deposits will only grant the minimum yield.
Ice Asteroid:
- 
Energy Credits, 
Exotic Gases
Gas Giant, Toxic World:
- Exotic Gases
Broken World, Shattered World:
- 
Minerals, Alloys
Barren World:
- Minerals
Asteroid:
- Minerals, 
Volatile Motes
Crystalline Asteroid, Frozen World:
- 
Rare Crystals
Molten World:
- Volatile Motes
Source: common/game_concepts (concept_arkship_harvest_resources_planet_resources) and localisation/english, Stellaris Cygnus v4.5.2 (9776).