Brief
The Rainbow Caves are a source of the 5 different types of quartz in the game. Those quartz are the key resources for some major advancements and make for an awesome end game! Plus the caves themselves just look pretty cool...
Video
Rainbow Cave Map
If you have the map unlock, here is the rough area where you'll find the various caverns and entrances of the Rainbow Caves:
A Few Things Not In The Video...
A few more notes about ways you'll need quartz that may not be obvious as you're playing:
You can eventually unlock a 'light box' that can be crafted with 1 solar quartz and 2 silicon, which is one of the best lighting elements in the game
1 of the 3 endings to the game requires 5 solar quartz
Pulsar quartz is the most efficient way to generate terra tokens, albeit a tad expensive to set up the infrastructure.
A few more gear pieces need quartz as well, T3 torch, T3 deconstruction, T3 blueprint pinning
If you haven't noticed, you can put fusion energy cells crafted with pulsar quartz into reactors in some of the wrecks on the map to unlock extra doors for high tier loot
And lastly, when doing portal runs for more quartz, you can just keep scanning until you find something that is high rarity and low difficulty, or something that fits the specific quartz you have to spend.
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=3234075257
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