mineral

Milky quartz cluster

Quartz (silicon dioxide, SiO₂), massive to drusy crystalline aggregate

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous to sugary luster; Mohs hardness 7, no cleavage, conchoidal fracture, and trigonal crystal structure. The specimen appears as intergrown milky quartz masses with fine sparkling surfaces and minor dark matrix/inclusions.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids fill fractures and cavities, precipitating quartz as veins or clusters; individual crystals may range from ancient Precambrian to young hydrothermal deposits. Exact age cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, foundry materials, and electronics; attractive clusters are sold as inexpensive décor and educational specimens. It is generally not gem-quality due to opacity and irregular form.

Geological facts

Milky color results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many veins.

Field identification & locations

Identify by its glassy sparkle, hardness (it can scratch ordinary glass), lack of cleavage, and irregular/conchoidal fracture; it should not fizz in dilute acid. Common worldwide, especially in hydrothermal veins and pegmatites.