metamorphic

Tumbled quartzite pebble

Quartzite, predominantly crystalline SiO₂

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale cream to honey coloration with orange iron-oxide staining, vitreous-to-waxy luster, massive granular texture, and no obvious cleavage. The smoothly rounded shape indicates mechanical tumbling or natural abrasion.

Identified September 10, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite forms when quartz-rich sandstone is recrystallized under heat and pressure, commonly during mountain-building; its age depends on the source formation, often Precambrian to Paleozoic. This specimen was likely shaped in a rock tumbler or by stream abrasion.

Uses & applications

Used as durable aggregate, decorative stone, landscaping material, and occasionally as a lapidary or carving stone; this piece has modest ornamental value.

Geological facts

Quartzite is generally more resistant to weathering than its parent sandstone and can scratch ordinary glass. Orange coloration typically comes from hematite or goethite coatings and inclusions.

Field identification & locations

Identify it by its very high hardness, granular quartz texture, and lack of visible sand grains or strong cleavage; it commonly occurs in mountain belts and river gravels worldwide. A glass-scratch test can help confirm it, though it may damage the surface.