igneous, sedimentary, and metamorphic mix
Mixed Gravel and Pebbles
Polylithic Alluvial Aggregate
Hardness varies from 3 to 7 on the Mohs scale depending on the mineral content; colors include various shades of gray, brown, tan, pink, and white; luster ranges from dull to vitreous; heterogeneous crystal structures.
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Physical properties
Hardness varies from 3 to 7 on the Mohs scale depending on the mineral content; colors include various shades of gray, brown, tan, pink, and white; luster ranges from dull to vitreous; heterogeneous crystal structures.
Formation & geological history
Formed through the weathering, erosion, transportation, and deposition of various parent rocks by water, ice, or wind, often found in riverbeds, glacial tills, and beaches over varying geological timescales.
Uses & applications
Used primarily in construction for concrete aggregate, road base, landscaping, and drainage.
Geological facts
Such collections often contain a diverse geological history representing multiple rock types from a local watershed.
Field identification & locations
Identified by a mix of rounded or sub-rounded small stones of varying compositions, commonly found in riverbanks, driveways, and garden beds.
More like this
Other igneous, sedimentary, and metamorphic mix specimens
Crushed Stone / Gravel (Multiple Rock Types)
Lithic fragments (undifferentiated)
Igneous, Sedimentary, and Metamorphic mix
Pebble Gravel Mix (Quartzite, Basalt, Chert)
Alluvial River Gravel / Aggregate Clasts
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Magnetite / Hematite mix
Magnetite (Fe3O4) and Hematite (Fe2O3)
mineral
Healer's Gold (Pyrite and Magnetite in Schist)
Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist
metamorphic