Rock Identifier

Category

Sedimentary (Alluvial Deposit)

Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.

Learn about Sedimentary (Alluvial Deposit) in the encyclopedia

Turbidite

Sapropel

Rock Gypsum

Mixed river stones and gravel (Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate) — igneous, sedimentary, metamorphic

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

igneous, sedimentary, metamorphic

Conglomerate (Conglomerate Rock) — sedimentary

Conglomerate

Conglomerate Rock

Quartz Pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Black Pebble (Basalt / Chert) (SiO2 (if Chert) or Mafic Igneous Rock (if Basalt)) — igneous

Black Pebble (Basalt / Chert)

SiO2 (if Chert) or Mafic Igneous Rock (if Basalt)

Jasper (Silicon Dioxide (Quartz variety, SiO2)) — mineral

Jasper

Silicon Dioxide (Quartz variety, SiO2)

Gold Nugget Cluster (Native Gold (Au)) — mineral

Gold Nugget Cluster

Native Gold (Au)

Rough Quartz (Alluvial Pebbles) (Silicon Dioxide (SiO2)) — mineral

Rough Quartz (Alluvial Pebbles)

Silicon Dioxide (SiO2)

Quartz (Agate/Chalcedony variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Agate/Chalcedony variety)

Silicon Dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Diamond (in jewelry) (Carbon (C)) — mineral

Diamond (in jewelry)

Carbon (C)

Banded River Cobble with Mafic Dike (Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion) — igneous and sedimentary

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

igneous and sedimentary

Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Pink Garnet (likely Almandine or Rhodolite) (Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)) — mineral

Pink Garnet (likely Almandine or Rhodolite)

Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)

Jasper (Silicon Dioxide (Microcrystalline Quartz), SiO2) — sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Yellow Quartz / Chalcedony Pebble (SiO2 (Silicon Dioxide)) — sedimentary

Yellow Quartz / Chalcedony Pebble

SiO2 (Silicon Dioxide)

Sand (Construction Grade) (Unconsolidated siliciclastic sediment (primarily SiO2)) — sedimentary

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Conglomerate (Conglomerate (sedimentary clastic rock)) — sedimentary

Conglomerate

Conglomerate (sedimentary clastic rock)

Siltstone (Siltstone (siliciclastic sedimentary rock)) — sedimentary

Siltstone

Siltstone (siliciclastic sedimentary rock)

Yellow Agate (Aqeeq / Chalcedony) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Yellow Agate (Aqeeq / Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Conglomerate (Conglomerate (Sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (Sedimentary rock)

Diamond (C (Carbon)) — gemstone

Diamond

C (Carbon)

Conglomerate (Conglomerate (Sedimentary Clastic Rock)) — sedimentary

Conglomerate

Conglomerate (Sedimentary Clastic Rock)

Sandstone (Quartzite-rich) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Conglomerate (Clastic sedimentary rock (Puddingstone)) — sedimentary

Conglomerate

Clastic sedimentary rock (Puddingstone)

Conglomerate (Conglomerate (SiO2 primary clasts with lithic matrix)) — sedimentary

Conglomerate

Conglomerate (SiO2 primary clasts with lithic matrix)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz / Common Agate (Silicon Dioxide (SiO2)) — mineral

Quartz / Common Agate

Silicon Dioxide (SiO2)

Carnelian Agate (Chalcedony (SiO2 with Iron Oxide impurities)) — mineral

Carnelian Agate

Chalcedony (SiO2 with Iron Oxide impurities)

Chert (River Pebble) (Microcrystalline silica (SiO2)) — sedimentary

Chert (River Pebble)

Microcrystalline silica (SiO2)

River Cobble (Sandstone / Greywacke) (Sedimentary Rock (predominantly Quartz, Feldspar, Lithic fragments)) — sedimentary

River Cobble (Sandstone / Greywacke)

Sedimentary Rock (predominantly Quartz, Feldspar, Lithic fragments)

Quartz (Common or Milky) (Silicon Dioxide (SiO2)) — mineral

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Red Jasper (Silicon dioxide (SiO2) with iron oxide impurities) — mineral

Red Jasper

Silicon dioxide (SiO2) with iron oxide impurities

Silty Sand / Loam (Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)) — sedimentary

Silty Sand / Loam

Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)

Small rounded pebble, likely quartz-rich river stone (Indeterminate; likely quartz/chert-bearing lithic clast) — sedimentary

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Yellow Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)