metamorphic

Pink quartzite pebble

Quartzite; predominantly microcrystalline quartz (SiO₂), with minor iron-oxide or feldspar impurities

AI-generated identification · may be incorrect

Typically Mohs hardness 7, dense and very tough, with a fine-grained sugary texture, pink-to-purple color, and dull to subtly vitreous luster. Quartz has no cleavage and conchoidal to irregular fracture; exact identification is limited by the photograph.

Identified August 31, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when quartz-rich sandstone is recrystallized under intense heat and pressure, commonly during mountain-building; its age depends on the source formation and may range from Precambrian to younger geologic periods.

Uses & applications

Used as crushed stone, aggregate, paving, countertops, landscaping rock, and decorative or tumbled specimens. This small rounded piece has modest collector value.

Geological facts

Quartzite is commonly confused with quartz-rich sandstone, but its grains are fused and it breaks across grains rather than around them. The pink color commonly reflects hematite or other iron-bearing impurities.

Field identification & locations

Common in metamorphic mountain belts and alluvial gravel deposits worldwide; major sources include Brazil, India, the United States, and Scandinavia. A steel file should barely scratch it, while quartz or glass should not scratch it; acid produces no reaction.