metamorphic

Weathered, iron-stained quartz-rich rock (possibly quartzite)

Likely quartzite, composed mainly of quartz (SiO₂); identification is provisional from the image

AI-generated identification · may be incorrect

Tan, rusty orange, and dark gray; rough, granular surface with iron-oxide staining. Quartz is Mohs 7 with vitreous luster and no cleavage; grain size and texture here are difficult to confirm visually.

Identified September 29, 2026More metamorphic →

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Physical properties

Formation & geological history

If quartzite, it formed when quartz-rich sandstone was recrystallized by heat and pressure; this process has occurred across many geological ages and settings. The rusty colors likely result from iron-bearing minerals weathering near the surface.

Uses & applications

Quartzite is used as building and paving stone, aggregate, and decorative material; this small weathered specimen is mainly suitable for collecting.

Geological facts

Quartzite is typically hard and resists scratching by a steel knife; unlike sandstone, its quartz grains are tightly fused. The dark patch may be an iron- or manganese-rich area, but cannot be identified confidently from the photo.

Field identification & locations

Look for a quartz-rich, hard rock that scratches glass and often breaks across grains rather than around them. Quartzite occurs worldwide in metamorphic terrains; the image alone cannot establish a definitive identification or locality.