metamorphic
Pink quartzite pebble
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly iron-oxide stained
AI-generated identification · may be incorrectHardness about 7 Mohs; pale pink to cream, granular and opaque-to-translucent, with a vitreous to sugary luster. Quartz grains are interlocked and show no obvious cleavage; specific gravity is about 2.65.
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Physical properties
Hardness about 7 Mohs; pale pink to cream, granular and opaque-to-translucent, with a vitreous to sugary luster. Quartz grains are interlocked and show no obvious cleavage; specific gravity is about 2.65.
Formation & geological history
Formed when quartz-rich sandstone was recrystallized under heat and pressure, commonly during mountain-building; the specimen’s exact geological age cannot be determined from the photograph. Its pink color may result from hematite or feldspar impurities.
Uses & applications
Quartzite is used as durable aggregate, paving and building stone, countertops, and decorative material; small attractive pieces are sold as inexpensive curios or lapidary rough.
Geological facts
Quartzite is generally harder and more resistant to weathering than its sandstone precursor. The rounded shape indicates transport and abrasion in a stream, beach, or gravel deposit.
Field identification & locations
Identify it by its sugary quartz texture, high hardness, lack of layering, and inability to scratch it with a steel knife; it should scratch glass. Common in mountain belts and quartz-rich river gravels.
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