mineral

Milky quartz vein in iron-stained host rock

Quartz, SiO₂; host rock is not identifiable from the image

AI-generated identification · may be incorrect

White, opaque-to-translucent, glassy to dull quartz with rusty-brown iron-oxide staining; Mohs hardness 7, hexagonal crystal structure, no cleavage, uneven fracture. The host appears brown and weathered, but its composition cannot be determined visually.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely quartz deposited from silica-rich fluids in a crack or vein, with later iron-oxide staining during weathering. Its age and the host rock’s geological setting cannot be established from the photo.

Uses & applications

Common quartz is used in glass, ceramics, electronics, and ornamental stone; this rough specimen is mainly of collecting or educational interest.

Geological facts

Milky appearance results from microscopic fluid or gas inclusions and fractures that scatter light. Rust-colored patches commonly reflect iron-bearing minerals altered near the surface.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and a glassy or irregular fracture; rusty staining alone does not identify the host. Similar quartz veins occur in many rock types worldwide.