Mineral composed of silicon dioxide.

Silica glass, high purity, non-crystalline.

an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars.

an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic texture.

Pink crystal symbolizing love, healing.

Silica-based, transparent, high-temperature-resistant material.

Mineral quartz found in veins.

Brownish gray, translucent quartz variety.

Igneous rock with large crystals.