This chakra nature can also manipulate other related materials such as lime, which is an alkaline powder, rather than molten rock.
When Roshi's Lava Style is first referred to, the kanji, with the radical for "fire", is used. In later references when Mei's is used, the kanji, with the radical for "water", is used instead. When both Kurotsuchi and Dodai used it, it was once again with the fire radical. This seems to indicate that the Lava Release from Iwagakure and Kumogakure uses the fire radical, while the Lava Stylle from Kirigakure uses the water radical. However, both kanji have been used to refer to Lava Style.
Nowadays, the two kanji are synonyms and used interchangeably, with being the more common variant. However, there seems to be a subtle difference in meaning between the two. The kanji with the fire radical seems to be used more often in words relating to metal and other solids, whereas the kanji with the water radical is more often used in words relating to liquids.
This kekkei genkai element shows the most different users with no known blood connection to each other.