Sturdy Quartzite

Found behind an aerosol near the a pile of bones and teeth, inside Toxic Anthill: South Entrance.

Found in the Anthill, behind the nearby Dead Root.

Located in the tunnel. Blow up the cracked wall to the right at the first intersection, and follow the path behind. Turn left at the bottom and follow the wall to find the node.

Located on floor B11 of the Pneumatic Transit System bunker. Inside the bunker follow the corridors down until you reach a SCA.B 2K Scanner door. Opposite the door is a broken glass panel. Go through the panel and turn right to find the Quartzite.

Located on floor B11 of the Pneumatic Transit System bunker. Inside the bunker follow the corridors down until you reach a SCA.B 2K Scanner door. Opposite the door is a broken glass panel. Go through the panel and turn left to find the Quartzite.

Under the blue box by the table.

Found by the base of the table.

Lying next to a tree root, near the Dead Root.

Can be found near the crushed drink carton.

On the ground near a Pinecone.

Found behind the body in the underground tunnels of the Spider Den Anthill.

Found deep underground in the Spider Den Anthill, in the cavern with the suspended stones.

Found right at the bottom of the fire pit.

In the cavern at the bottom of the underground tunnel.

In the underground tunnel, accessible via the entrance behind the Dead Root.

Behind the dead root in the tunnel accessible via the space under the amp.

In the tunnel accessible via the space under the amp.