Makes sense, now the question is - does the DawnTeamMC team have any plans for adding Calcite variants if there will be a 1.18 version of this mod?

The reason for this is because Calcite is not a stone variant in 1.17, it only generates as part of geodes.
Only in 1.18 experimental snapshots it became a stone variant, and the mod was not made for that.

Of course.