mineral

Clear quartz crystal fragments

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Colorless to translucent, vitreous luster, typically hexagonal crystal structure, no true cleavage but conchoidal fracture; Mohs hardness 7 and specific gravity about 2.65. The pieces appear fractured or tumbled, so crystal faces are partly obscured.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, hydrothermal, and metamorphic environments as silica-rich fluids cool or rocks recrystallize. It is extremely common and ranges from Precambrian to modern geological ages.

Uses & applications

Used for glass, electronics, abrasives, engineered stone, and decorative specimens; clear crystals may be used in jewelry, though these pieces appear common-grade. Estimated value is about $1–$15 for this small lot, or up to $20–$50 if exceptionally clear and naturally well-formed.

Geological facts

Quartz is piezoelectric, meaning it generates an electrical charge under pressure and is used in watches and frequency-control devices.

Field identification & locations

Identify it by its glassy appearance, hardness, lack of cleavage, and conchoidal fractures; it should scratch ordinary glass but not be scratched by a steel knife. Common sources include Brazil, Madagascar, the United States, and many hydrothermal veins worldwide.