Gravitite

Gravitite (グラヴィタイト Guravitaito), commonly known as Gravium Ore (グラヴィウム鉱石 Guraviumu Kōseki), is a mineral of gravium.

Properties
Gravitite, like gravium, decays by emitting gravitons, which create a gravitational field around it.

Etymology
Gravitite is a combination of gravium and the suffix -ite, which is used to denote rocks or minerals.