Where to Get Basalt - Dune Awakening Guide - IGN

Basalt is a black stone found in the mid to late game of Dune: Awakening. There are no other colors running through the stone and it's easy to tell apart from Granite due to its dark shade.

Basalt is found, along with Aluminum Ore, in the Eastern Shield Wall, Western Shield Wall. It's also found in the Mysa Tarill, Sheol, and The O'odham. You need a Cutteray Mk3 or higher to mine the large nodes, but can collect the small pieces typically found around it with ease.