Quartz
From Memory Alpha, the free Star Trek reference
Quartz is a mineral found throughout the galaxy.
It was present in the explosive mineral formations on Gamma Trianguli VI, along with hornblende and uraninite. (TOS: "The Apple")
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. (VOY: "Prime Factors")
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. (ENT: "Carbon Creek")
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. (DS9: "Q-Less")
