Raritanium (Sargasso) are blue crystals that you will find during the game. To collect them you should smash them with your hammer. If you've been near some raritanium, it'll appear on your map. Raritanium can be used to upgrade your weapons (stat boosts and new abilities). To upgrade a weapon you must talk to Ms. Zurkon and navigate to the upgrades tab.
Raritanium, Sargasso
Locations on Sargasso
1
Raritanium
After defeating the Seekerpede.
2Raritanium
3Raritanium
4Raritanium
5Raritanium
6Raritanium
7Raritanium
8Raritanium
To be able to get here you need to collect 30 Zurpstones and then you will be able to fly here on Trudi.
9Raritanium
10Raritanium
11Raritanium
12Raritanium
13Raritanium
14Raritanium
15Raritanium
16Raritanium
17Raritanium x 2
You will be able to get here during your second story visit to this planet.
18Raritanium x 3
It's inside the Pocket Dimension (Sargasso #2).
19Raritanium x 3
20Raritanium x 3
Inside the Pocket Dimension (Sargasso #1).
