Quartz (Subnautica)
Quartz is a material found on the seabed and in some caves.
In the Safe Shallows biome, it may sometimes be a bit hard to spot Quartz crystals, as they are in most cases hidden in the grass.
At night, spotting Quartz crystals becomes way easier, as the crystals gather the remaining light, which makes it easy to distinguish them from the surrounding grass.