mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster and massive, irregular texture; Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The specimen appears weathered and iron-stained, possibly with minor feldspar or other inclusions.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, pegmatites, and cavities in igneous and metamorphic rocks when silica-rich fluids crystallize. Quartz is geologically widespread across Earth’s history, with no single formation age inferable from the image.

Uses & applications

Used for glass, ceramics, abrasives, foundry materials, electronics, and engineered stone; attractive translucent pieces may be sold as inexpensive lapidary or decorative specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and has a six-sided trigonal crystal structure, although massive milky quartz often lacks visible crystal faces.

Field identification & locations

Identify by its glassy appearance, hardness—scratching ordinary glass—and lack of cleavage; it should not be confused with softer calcite. Common worldwide, especially in quartz veins and granitic pegmatites.