mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Usually white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears granular and weathered, with possible iron-oxide staining.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous rocks; it may also be a fragment of quartz-rich pegmatite or vein material. Quartz occurs from ancient Precambrian rocks to modern hydrothermal deposits.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are collected or used decoratively. This small rough fragment has little commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge when mechanically stressed.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and typically conchoidal fracture. Common worldwide, especially in granite, pegmatites, quartz veins, and hydrothermal deposits.