Why does this old man speak of stone burners here?

"You will assemble the proper equipment and search out the place where the stone burner was made."

We know who brought the stone burner here from Tarahell.

The fragrance lamp's process is initiated by lighting the stone burner seated at the mouth of the lamp.

The Sardaukar began hammering on the thick door as he removed the stone burner from its case and studied the controls.

He simply looked down at the scant remaining time on the stone burner.

Dominic set off a stone burner and destroyed them all.

The first damage had been done; and now they must wait out the extent of the stone burner's potency.

The Tleilaxu also provide artificial eyes for soldiers blinded by a stone burner.

He felt the stone burner die, silence beneath him.