mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, and conchoidal fracture without cleavage. It has a trigonal crystal structure, though this specimen appears as a rough, broken fragment rather than a well-formed crystal.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in igneous, metamorphic, or hydrothermal environments; individual specimens may range from Precambrian to recent. The cloudy appearance results from microscopic fluid inclusions or structural defects.

Uses & applications

Used in glassmaking, ceramics, abrasives, countertops, electronics, and lapidary work; attractive translucent pieces are collected or polished for decoration.

Geological facts

Quartz is one of Earth’s most abundant minerals and is chemically resistant to weathering. Milky quartz commonly occurs alongside granite, pegmatite, and hydrothermal veins.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; unlike calcite, it does not effervesce in dilute acid. Common worldwide, especially in Brazil, Madagascar, the United States, and alpine veins.