Fountains are locations where the crystals flow up to the earth's surface and this is the place to harvest them.
There are 5 colored variants. One for each type of Crystal.
On the Map you see where fountains are.
Fountains refill continuously up to their max value. The image of the fountains vary in size according to how much they contain right now.
The image of the fountains vary in size depending on the current capacity of the fountain. Fountains continuously refill up to their maximum value.
There are 3 types of each color. They vary in max value, 20 to 34, and refill speed.
One has higher maximum value but lower refill speed, one has average on both and one low maximum value and high refill speed.
When fountains are empty they disappear from the map, but don't worry! They will come back after some time. The time depend on their refill speed (keep reading).
The refill speed varies with the type but also with how many players have harvested from the fountain in the last few days. Many different players means it refill faster.