metamorphic

Weathered quartz-rich rock, possibly quartzite or quartz vein fragment

Quartzite (mostly microcrystalline SiO₂), identification uncertain from image

AI-generated identification · may be incorrect

Cream to yellow-brown, granular and highly weathered, with vitreous-to-dull luster and no obvious cleavage; quartz hardness is Mohs 7, though surface alteration lowers apparent hardness. The rough, porous texture may reflect iron-oxide staining or a weathered quartz vein.

Identified September 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed from quartz-rich sandstone metamorphosed under heat and pressure, or crystallized as a hydrothermal quartz vein, then exposed and weathered. Precise age and origin require a fresh surface or laboratory testing.

Uses & applications

Common quartzite is used as aggregate, landscaping stone, and durable building material; attractive pieces may be collected but are generally not gem-grade.

Geological facts

Yellow, orange, and brown coloration commonly comes from limonite/goethite coatings or inclusions. A glass-scratching test and lack of reaction with dilute hydrochloric acid support quartz-rich composition.

Field identification & locations

Look for abundant interlocking quartz grains, very high scratch resistance, and absence of fizzing; common in metamorphic terrains, stream gravels, and eroded quartz-vein zones. The image alone cannot distinguish quartzite from weathered quartz or quartz-bearing rock.