mineral

Milky quartz vein fragment

Quartz (silicon dioxide, SiO₂), likely with iron-oxide staining and minor host rock

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to translucent gray, vitreous to waxy luster, hexagonal crystal structure, and no cleavage; fractures conchoidally. The rusty orange-brown areas are probably limonite/goethite coatings or inclusions.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich hydrothermal fluids filled fractures in older rock, later crystallizing as quartz veins; the specimen’s exact age depends on its host geology. Common in igneous, metamorphic, and mineralized terrains.

Uses & applications

Quartz is used in glass, ceramics, abrasives, electronics, and ornamental stone; attractive transparent pieces may be cut or collected, though this fragment appears mainly geological rather than gem quality.

Geological facts

Milky quartz becomes cloudy from microscopic fluid inclusions, fractures, or mineral impurities. Iron oxidation commonly produces the contrasting rusty veining seen here.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; a steel knife should not scratch it. Common worldwide, especially in hydrothermal vein districts.