mineral

Milky quartz (with iron-oxide staining)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous to waxy luster, irregular fracture, no cleavage, and hexagonal crystal structure. The yellow-brown patches are likely limonite/goethite staining or minor inclusions; the specimen appears rough-cut or naturally broken.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed when silica-rich fluids crystallized in fractures or cavities, commonly in igneous, metamorphic, and hydrothermal environments. Its age is undetermined from the image and may range from millions to billions of years.

Uses & applications

Used for glass, ceramics, abrasives, countertops, and electronics; attractive pieces are sold as décor or mineral specimens. It is generally not gem-quality because of cloudiness and fractures.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or mineral impurities scattering light. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; a steel file will not scratch it readily. Common worldwide, especially in veins and granitic or metamorphic terrains.