From Minetest Wiki
|Only available in development version!
This article describes a feature in an upcoming release of Minetest. It has become a part of the development version of Minetest and will likely become a part of the following stable release. However, things may be subject to change before release.
|A block in Minetest Game|
Another difference lies in map generation: Cave ice will be generated in ice sheet biomes and tunnels and caves may be carved through cave ice, while for ordinary ice, this is not the case.