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A helictite is a speleothem found in limestone caves ... They are usually made of needle-form calcite and aragonite. Forms of helictites have been described in several types: ribbon helictites, saws, rods, butterflies, "hands", curly-fries, and "clumps of worms."
I'm not sure I would call these Helictites, but they could have been formed by a similar mineral deposit growth process.