Quartz

Quartz was a mineral found throughout the galaxy.

It was present in the explosive mineral formations on Gamma Trianguli VI, along with hornblende and uraninite. 

The planet Sikaris had a mantle of tetrahedral quartz twenty kilometers thick. The crystalline structure of the planet's mantle served as an amplifier for the Sikarians' spatial trajector technology. 

Following a mine cave-in that occurred near Carbon Creek, Pennsylvania, on Earth, Mestral cut through a wall containing a stratum of quartz to free the trapped miners. 

Among the artifacts Vash brought back from the Gamma Quadrant in 2369 included an object that appeared to be some kind of Promethean quartz, however, its molecular density and refraction index was much higher.