Composition The Elephant's Foot is composed primarily of silicon dioxide, with traces of uranium, titanium, zirconium, magnesium and graphite. The mass is largely homogeneous, though the depolymerized silicate glass contains occasional crystalline grains of zircon. These grains of zircon are not elongated, suggesting a moderate crystallization rate. While uranium dioxide dendrites grew quickly at high temperatures within the lava, the zircon began crystallization during slow cooling of the lava. Despite the distribution of uranium bearing particles not being uniform, the radioactivity of the mass is evenly distributed. The mass is quite dense and unyielding to a drill mounted on a remote controlled trolley, it able to be damaged by a Kalashnikov rifle AK 47 using armor piercing rounds. 2 B