mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Hardness of 7 on Mohs scale; color ranges from transparent clear to white/cloudy with subtle iridescence or phantom tones; vitreous (glass-like) luster; hexagonal crystal system (prismatic shape with pyramidal termination); conchoidal fracture; specific gravity 2.65.

Identified July 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal crystallization in igneous pegmatites, hydrothermal veins, and metamorphic rocks. Forms as silica-rich fluids cool and crystallize in rock cavities.

Uses & applications

Used in electronics for quartz oscillators, optical components, abrasive manufacturing, glassmaking, jewelry, and gemstone collecting.

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust. Its piezoelectric properties generate an electrical charge when mechanical pressure is applied, making it essential in timekeeping technology.

Field identification & locations

Identified by its classic six-sided hexagonal prism shape with pointed pyramidal termination, hardness capable of scratching glass, and lack of true cleavage. Commonly collected worldwide in pegmatite and vein formations.