From Halopedia, the Halo wiki
Vanadinite Mountain was a mountain in the Csongrád Region, Highland Mountains, Eposz, on the human Inner Colony world of Reach. It was in the same valley area as Omeiite Mountain and Menachite Mountain
On October 12, 2559, during Operation: WOLFE, Blue Team were on the shoulder of the mountain looking out at the valley that contained Omeiite Mountain and the rubble of the destroyed Menachite Mountain.
The mountain is named after the mineral Vanadinite.