metamorphic

Iron-rich quartzite or ironstone pebble

Quartzite dominated by quartz (SiO₂), with hematite/goethite staining

AI-generated identification · may be incorrect

Brown-orange and gray, granular to subtly glassy luster, massive texture, and no obvious cleavage; quartz hardness is about Mohs 7, with iron oxides commonly lowering apparent toughness and producing rusty streaks.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when quartz-rich sandstone was metamorphosed and later weathered, concentrating iron oxides; its exact geological age cannot be determined from the photograph. It may also be a weathered ironstone or jasper-like material.

Uses & applications

Useful mainly as a decorative, landscaping, or collecting specimen; quartzite can serve as aggregate or building stone, though this small piece has little commercial value.

Geological facts

The rusty coloration commonly comes from hematite (Fe₂O₃) or goethite, while the gray translucent areas are likely quartz. A steel file should not easily scratch a quartz-rich surface.

Field identification & locations

Common in eroded stream gravels and quartzite-bearing terrains worldwide; inspect for interlocking quartz grains, hardness, and a rusty red-brown streak. A definitive identification requires a fresh surface, streak test, and possibly acid or microscopy.