metamorphic

Weathered quartz-rich rock, likely milky quartz/quartzite

Quartz (SiO₂), possibly quartzite with minor iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 7 Mohs; white to cream with tan-brown staining, translucent patches, and vitreous to waxy luster. Quartz has a trigonal crystal structure and no cleavage, producing irregular fractures; quartzite is typically very tough and massive.

Identified August 11, 2026More metamorphic →

Explore Weathered quartz-rich rock, likely milky quartz/quartzite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Likely formed from quartz-rich sandstone metamorphosed by heat and pressure, with later weathering and iron-oxide staining. The exact geological age cannot be determined from the photograph.

Uses & applications

Common quartzite is used as crushed aggregate, road stone, building stone, and landscaping rock; attractive pieces may be collected or polished but have limited gem value.

Geological facts

The rounded surface suggests prolonged weathering or transport. A steel file should not scratch fresh quartz, while quartzite commonly gives a glassy scratch and may contain interlocking quartz grains.

Field identification & locations

Common in metamorphic belts and stream gravels worldwide, especially mountain regions. Confirm by testing hardness, examining a fresh surface for fused quartz grains, and checking for acid reaction—none is expected.