Basically all ice is fresh water. Ice that forms from sea water (sea ice) will be composed of fresh water ice and pockets of salt water (brine) which generally

Basically all ice is fresh water. Ice that forms from sea water (sea ice) will be composed of fresh water ice and pockets of salt water (brine) which generally drain themselves out reasonably quickly. Ice that comes from glaciation which I believe this iceberg is would just be fresh water from the start.