From the Super Mario Wiki
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A fire jet (also called flame spurt) is a mechanical, indestructible flamethrower found in Super Mario 64 and its remake. The appearance of a fire jet varies depending on the level. In all of the Bowser levels and Rainbow Ride, fire jets are stone and diamond-shaped. In the main course of Lethal Lava Land, one appears near the volcano as a black brick, and inside of the volcano, they appear as holes in the walls.
About every three seconds, a fire jet shoots a stream of fire from its center. If hit by the flames, the player character will lose three life points and run around in a panic, making it difficult for the player to control them. If the character jumps repeatedly while they're on fire, their movement will be limited and may only take two points of damage.