mineral

Milky quartz / quartz-rich vein rock

Quartz (SiO₂), likely massive milky quartz with iron-oxide staining and minor attached host rock

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to cream and honey-brown, vitreous to greasy luster, translucent edges, no cleavage, conchoidal fracture, trigonal crystal structure, specific gravity about 2.65. The specimen appears massive and fractured rather than composed of well-formed crystals.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms when silica-rich hydrothermal fluids fill fractures in older country rock; the brown coloration is likely limonite or iron-oxide staining. Its precise geological age and host formation cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, foundry materials, abrasives, electronics, and engineered stone; attractive pieces are collected or used decoratively. This rough specimen has modest ornamental value.

Geological facts

Milky quartz owes its opacity to microscopic fluid inclusions, fractures, or mineral impurities. Honey-brown surfaces commonly result from weathering and iron staining rather than a different quartz variety.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it should not be confused with calcite, which is softer and cleaves readily. Common worldwide in veins, pegmatites, and metamorphic terrains.