mineral

Milky quartz crystal

Quartz, silicon dioxide (SiO₂), likely a small prismatic crystal or crystal fragment

AI-generated identification · may be incorrect

Mohs hardness 7; white to translucent, vitreous-to-waxy luster, hexagonal crystal system, and no true cleavage, with uneven conchoidal fracture. The cloudy appearance reflects microscopic fluid inclusions or structural defects.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids cool in fractures and cavities, commonly in igneous and metamorphic rocks; quartz crystallization spans much of Earth’s geologic history. Its elongated shape suggests growth in an open cavity, though the specimen may be naturally broken or lightly processed.

Uses & applications

Used chiefly as a teaching, collecting, and lapidary specimen; quartz is also important in glass, ceramics, electronics, abrasives, and engineered stone. This small, cloudy piece has limited gem value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge when mechanically stressed. Milky quartz is common but can occasionally contain attractive inclusions or veils.

Field identification & locations

Identify it by its glassy translucence, hardness, lack of cleavage, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common worldwide, especially in hydrothermal veins and granite-related cavities.