Rock Identifier

Category

Sedimentary (Alluvial Deposit)

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

Aquamarine (Beryl (Be₃Al₂Si₆O₁₈)) — mineral

Aquamarine

Beryl (Be₃Al₂Si₆O₁₈)

mineral
Black Spinel (Magnesium Aluminum Oxide (MgAl2O4)) — mineral

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

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

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities

mineral
River Pebble Gravel (Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)) — sedimentary

River Pebble Gravel

Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)

sedimentary
Quartz (Milky/Common) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

mineral
Conglomerate (or Breccia) (Clastic Sedimentary Rock (Conglomeratic)) — sedimentary

Conglomerate (or Breccia)

Clastic Sedimentary Rock (Conglomeratic)

sedimentary
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
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)

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

Rough Quartz (Alluvial Pebbles)

Silicon Dioxide (SiO2)

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

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

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

Red Jasper

Silicon dioxide (SiO2) with iron oxide impurities

mineral
Siltstone (Siltstone (siliciclastic sedimentary rock)) — sedimentary

Siltstone

Siltstone (siliciclastic sedimentary rock)

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

Diamond (in jewelry)

Carbon (C)

mineral
Conglomerate (Clastic sedimentary rock (Puddingstone)) — sedimentary

Conglomerate

Clastic sedimentary rock (Puddingstone)

sedimentary
Conglomerate (Conglomerate (SiO2 dominant in clasts)) — sedimentary

Conglomerate

Conglomerate (SiO2 dominant in clasts)

sedimentary
Chert (Quartzite-rich River Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Quartzite-rich River Pebble)

Silicon Dioxide (SiO2)

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

Quartz / Common Agate

Silicon Dioxide (SiO2)

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

Carnelian Agate

Chalcedony (SiO2 with Iron Oxide impurities)

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

Conglomerate

Conglomerate (SiO2 primary clasts with lithic matrix)

sedimentary
Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

mineral
Native Gold (Native Gold (Au)) — mineral

Native Gold

Native Gold (Au)

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

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

mineral
Conglomerate (Conglomerate (Sedimentary Clastic Rock)) — sedimentary

Conglomerate

Conglomerate (Sedimentary Clastic Rock)

sedimentary
Ruby (Raw/Rough) (Corundum (Al2O3 with Chromium trace)) — mineral

Ruby (Raw/Rough)

Corundum (Al2O3 with Chromium trace)

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

Silty Sand / Loam

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

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

Gold Nugget

Native Gold (Au)

mineral
Chert (Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper)

Microcrystalline Quartz (SiO2)

sedimentary
Conglomerate (Conglomerative Sedimentary Rock) — sedimentary

Conglomerate

Conglomerative Sedimentary Rock

sedimentary
Milky Quartz (Gold-bearing Prospecting Specimen) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Gold-bearing Prospecting Specimen)

Silicon Dioxide (SiO2)

mineral
Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

metamorphic
Conglomerate (Conglomerate (Clastic Sedimentary Rock)) — sedimentary

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

sedimentary
Iron-Stained Quartz (Riverside Cobble) (Silicon Dioxide (SiO2) with Limonite/Hematite inclusions) — mineral

Iron-Stained Quartz (Riverside Cobble)

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

mineral
Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

sedimentary
Conglomerate (Conglomerate rock) — sedimentary

Conglomerate

Conglomerate rock

sedimentary
Arkosic Sandstone (Arkose) — sedimentary

Arkosic Sandstone

Arkose

sedimentary
Red Jasper (Siltstone variant) (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — sedimentary

Red Jasper (Siltstone variant)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

sedimentary
Conglomerate (or Breccia) (Clastic Sedimentary Rock) — sedimentary

Conglomerate (or Breccia)

Clastic Sedimentary Rock

sedimentary
Ruby (Corundum (Al2O3:Cr)) — mineral

Ruby

Corundum (Al2O3:Cr)

mineral
River Rock (River Cobbles) (Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)) — sedimentary

River Rock (River Cobbles)

Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)

sedimentary
Quartz (Tumbled/Polished Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Tumbled/Polished Pebble)

Silicon Dioxide (SiO2)

mineral
Puddingstone (Conglomerate) — Sedimentary

Puddingstone

Conglomerate

Sedimentary
Gold Nugget Jewelry (Native Gold (Au)) — mineral

Gold Nugget Jewelry

Native Gold (Au)

mineral