mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears massive and unpolished, with minor iron-stained or included areas.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks. Quartz is common from Precambrian through modern geological settings and has a worldwide distribution.

Uses & applications

Used in glass, ceramics, electronics, abrasives, and engineered stone; attractive pieces are sold as inexpensive mineral specimens. It is generally not gem quality unless exceptionally clear or well-formed.

Geological facts

Milky opacity results from microscopic fluid inclusions, fractures, or defects scattering light. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and irregular conchoidal fracture; avoid confusing it with calcite, which is softer and cleaves readily. Common localities include Brazil, Madagascar, the United States, and worldwide quartz veins.