Fusionstone is a material found on Bajor that the Bajorans have used as a building material for thousands of years. It is sometimes sand colored. (DS9 novel: Bajor: Fragments and Omens)

The walls of the Naghai Keep were built with fusionstone. (TLE - Terok Nor novel: Day of the Vipers)

The buildings and thoroughfares of Ashalla were constructed using fusionstone. (DS9 novel: Bajor: Fragments and Omens)

Fusionstone was used in the cells of the Elemspur detention center, a former monastery. (DS9 novel: Fearful Symmetry)