Niobium's name comes from Niobe from Greek mythology, who was the daughter of king Tantalus. This was chosen because of niobium's chemical similarity to tantalum. Niobe got turned into the Weeping Rock in Mount Sipylus. The rock formation is also known as under that name, since rainwater seeps through its porous limestone.

Because of that, I gave niobium one of the symbols for limestone/metal lime.

Links: [1] [2] [3] [4]

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