metamorphic

Rounded pale beach cobble, likely quartzite or massive quartz

Quartzite (mostly microcrystalline SiO₂); exact identification requires testing

AI-generated identification · may be incorrect

White to cream, fine-grained, dull to weakly vitreous luster, apparently massive with no visible cleavage; Mohs hardness about 7 and specific gravity near 2.65. The smooth shape reflects prolonged wave abrasion.

Identified September 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when quartz-rich sandstone recrystallized under metamorphic heat and pressure, commonly during ancient mountain-building events; its rounded form is geologically recent beach transport.

Uses & applications

Used as aggregate, landscaping stone, decorative cobbles, and occasionally dimension stone; this ordinary specimen has little jewelry value.

Geological facts

Quartzite is generally harder and more resistant to weathering than sandstone, though some pale beach cobbles may instead be limestone or altered feldspathic rock.

Field identification & locations

Common along beaches and gravel deposits worldwide. A steel nail should not scratch it, while quartz or a glass plate may scratch it; dilute hydrochloric acid distinguishes limestone by effervescence.