stalagmites

/S T AE1 L AH0 G M AY0 T S/
noun
  1. 1

    A secondary mineral deposit of calcium carbonate or other mineral, in shapes similar to icicles, that lie on the ground of a cave.

Source: https://en.wiktionary.org/wiki/stalagmite, https://en.wiktionary.org/wiki/stalagmites