sedimentary
Beach Pebble (Quartzite / Sandstone)
Quartz-rich sedimentary or metamorphic rock pebble
Hardness varies from 6 to 7 on the Mohs scale, color ranges from brown to grey with visible banding or mineral grains, luster is vitreous to dull when wet/dry, crystal structure is microcrystalline or granular.
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Physical properties
Hardness varies from 6 to 7 on the Mohs scale, color ranges from brown to grey with visible banding or mineral grains, luster is vitreous to dull when wet/dry, crystal structure is microcrystalline or granular.
Formation & geological history
Formed through the accumulation and cementation of mineral particles (sandstone) or subsequent metamorphism (quartzite), followed by millions of years of weathering, river transport, and wave action rounding the edges on a beach.
Uses & applications
Used primarily as decorative landscaping stones, aquarium gravel, or as a memento for beachcombers.
Geological facts
Beach pebbles show the immense power of water transport and wave action, which can completely smooth and round angular fragments into polished pebbles over long periods.
Field identification & locations
Found abundantly on beaches, riverbanks, and coastal areas worldwide. Identify by its smooth, water-worn, rounded shape and hard, durable mineral content.
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Generic Pebble / Rock Fragment
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Sedimentary Sandstone
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Banded Siltstone / Mudstone Pebble
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