metamorphic

Quartz vein in foliated metamorphic rock

Milky quartz (SiO₂) in likely schist or gneiss

AI-generated identification · may be incorrect

The white-to-translucent material is massive milky quartz, Mohs hardness 7, vitreous to waxy luster, no cleavage, and conchoidal fracture. The enclosing greenish-gray host appears foliated, likely chlorite/biotite-bearing schist or altered gneiss; yellow-brown areas are probably iron-oxide staining or weathering.

Identified September 6, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartz precipitated from silica-rich hydrothermal fluids in fractures, then became enclosed within and deformed with the metamorphic host during regional metamorphism. The exact geological age cannot be determined from the photograph; such veins occur in rocks from many Precambrian to younger terranes.

Uses & applications

Common quartz veins are mainly collector specimens and sources of crushed silica; attractive pieces may be used decoratively. The host rock can be used locally as landscaping stone, but this specimen has limited commercial value.

Geological facts

The irregular white band and contrasting foliation indicate a cross-cutting or partly folded quartz vein. Iron oxides commonly produce the ochre, honey, and reddish surface colors.

Field identification & locations

Identify it by its hard, pale quartz that scratches glass and contrasts with the layered green-gray host; a steel nail should not scratch the quartz. Quartz veins are widespread in mountain belts, especially hydrothermal and metamorphic terrains.