metamorphic
Rounded pinkish pebble, likely quartzite or microcrystalline quartz
Quartzite; predominantly quartz (SiO₂), possibly with iron-oxide staining
AI-generated identification · may be incorrectHardness about 7 Mohs; pale pink to gray-brown, dull to slightly waxy luster, very fine-grained and massive, with no visible cleavage. The smooth, rounded shape indicates natural water abrasion or tumbling.
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Physical properties
Hardness about 7 Mohs; pale pink to gray-brown, dull to slightly waxy luster, very fine-grained and massive, with no visible cleavage. The smooth, rounded shape indicates natural water abrasion or tumbling.
Formation & geological history
If quartzite, it formed when quartz-rich sandstone was recrystallized during metamorphism, commonly hundreds of millions to billions of years ago; the exact age and origin cannot be determined from the photograph.
Uses & applications
Small pieces are mainly used for collecting, crafts, and landscaping; larger quartzite is used as durable building stone, aggregate, and paving material. It has little jewelry value unless unusually colorful or patterned.
Geological facts
Quartzite is typically harder and more resistant to weathering than its sandstone precursor. A steel scratch test should generally fail to scratch it, while it may scratch ordinary glass.
Field identification & locations
Common in stream gravels and eroded quartz-rich terrains worldwide; inspect for interlocking quartz grains and test hardness, while dilute acid should produce no fizz. Exact identification requires a close examination or testing.
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