Asteroid Fields
From Interstellar Rift Wiki
Asteroid fields yield the minable resources in Interstellar Rift. Asteroid fields are marked with a grey triangle on a cockpit's head-up display.
There are different kinds of fields in a star system.
Water fields
Water fields come in two flavors. One yields pure Water the other one Waterand Nitrogen
Iron - Copper - Carbon
Default field around industrial-, Drifter- and mining-stations.