I didn't notice Kurotsuchi used Youton(Lava release) which is a bloodline limit combining earth and fire. She then followed up with a normal water jutsu to create what we would call cement.
Roshi, the old man Iwa jinchuuriki, could also use the lava element. Considering the jinchuuriki are usually related to the Kages, and learning Kuro is the Tsuchikage's granddaughter, probably explains where she got it from. How Mei Terumi ended up with Youton, which now seems more Iwagakure specific, is a mystery.
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