mineral

Milky quartz vein rock

Quartz, silicon dioxide (SiO₂), commonly with iron-oxide staining and minor mica or feldspar

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to gray with rusty brown inclusions, vitreous to waxy luster, massive granular texture, and no true cleavage. Specific gravity is about 2.65; fractures are typically conchoidal to uneven.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Likely quartz deposited from silica-rich hydrothermal fluids in a fracture, later stained by oxidized iron; associated host-rock fragments may be present. Quartz veins formed across many geological ages, commonly during mountain-building or igneous activity.

Uses & applications

Used as aggregate, silica feedstock, abrasives, and ornamental stone; attractive transparent pieces may be collected, though this specimen appears mainly lapidary or educational grade.

Geological facts

Milky appearance results from microscopic fluid inclusions and fractures scattering light. Iron oxides produce the tan, orange, and reddish patches.

Field identification & locations

Identify by its glassy appearance, very high hardness, lack of cleavage, and inability to scratch it with a steel knife; it should scratch ordinary glass. Common in hydrothermal veins worldwide, including Brazil, the United States, Australia, and Europe.