mixed
River Pebbles and Quartz
Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)
Hardness: 6-7 on Mohs scale; Color: variety of whites, browns, grays, and pinks; Luster: vitreous to dull/earthy; Crystal Structure: mainly cryptocrystalline or coarse-grained; Cleavage: none/conchoidal.
- Hardness
- 6-7 on Mohs scale
- Color
- variety of whites, browns, grays, and pinks
- Luster
- vitreous to dull/earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: variety of whites, browns, grays, and pinks; Luster: vitreous to dull/earthy; Crystal Structure: mainly cryptocrystalline or coarse-grained; Cleavage: none/conchoidal.
Formation & geological history
Formed through various geological processes including cooling of magma (granite), metamorphism (quartzite), and mechanical erosion in riverbeds or coastal environments over millions of years.
Uses & applications
Used in landscaping, decorative aquariums, craft jewelry, construction aggregates, and as starter pieces for rock tumbling and amateur collections.
Geological facts
River pebbles become smooth through a process called saltation, where they are bounced along a riverbed, grinding against other rocks to remove sharp edges.
Field identification & locations
Identify in the field by looking for rounded, smooth surfaces near water sources or glacial deposits. Common in all geographical regions with fluvial history.
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