metamorphic

Quartz vein in dark host rock

Milky quartz (SiO₂) cutting a likely iron-rich metamorphic host; exact host rock is uncertain from the image

AI-generated identification · may be incorrect

White, opaque to translucent quartz with a vitreous luster and irregular fracture; Mohs hardness 7, trigonal crystal structure, no cleavage. The host is dark brown and fine-grained, but cannot be identified confidently from the photo.

Identified October 6, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartz likely crystallized from silica-rich fluids filling a fracture in pre-existing rock. The age and exact formation setting cannot be determined visually.

Uses & applications

Mostly a collector specimen; quartz veins are also sources of silica and can host valuable ores. This rough piece is not suitable for jewelry without cutting.

Geological facts

Milky quartz appears white because tiny fluid or mineral inclusions scatter light. Veins form when mineral-rich fluids deposit crystals in cracks.

Field identification & locations

Look for quartz that scratches glass and lacks cleavage; a vein-hosted specimen typically shows a sharp contrast between the pale quartz and darker surrounding rock. Quartz veins occur worldwide.