mineral

Milky quartz

Quartz (SiO₂), likely massive milky quartz

AI-generated identification · may be incorrect

Typically white to translucent with a glassy-to-greasy luster; Mohs hardness 7, no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65. The specimen appears unpolished and massive, with cloudy internal inclusions or fractures.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids fill fractures and cavities, or crystallizes in igneous and metamorphic rocks. Quartz is geologically widespread and forms from Precambrian to present-day environments; this piece’s age cannot be determined visually.

Uses & applications

Used in glassmaking, foundry work, ceramics, abrasives, electronics, and engineered stone; attractive transparent pieces may be cut or collected, though ordinary milky quartz has limited jewelry value.

Geological facts

Its cloudiness commonly results from microscopic fluid inclusions, fractures, or mineral impurities rather than a different quartz species.

Field identification & locations

Identify by its hardness, lack of cleavage, vitreous luster, and ability to scratch glass; it should not be confused with calcite, which is softer and cleaves readily. Common worldwide, especially in quartz veins, granite pegmatites, and metamorphic rocks.