Rock Identifier

Category

Sedimentary (Alluvial Deposit)

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

Agate (Chalcedony) (Cryptocrystalline Silica or Silicon Dioxide (SiO2)) — mineral

Agate (Chalcedony)

Cryptocrystalline Silica or Silicon Dioxide (SiO2)

mineral
Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

mineral
Specular Hematite (Hematite (Fe2O3)) — mineral

Specular Hematite

Hematite (Fe2O3)

mineral
Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

mineral
Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

mineral
Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

sedimentary
Chalcedony Geode Fragment (Microcrystalline Quartz (SiO2)) — mineral

Chalcedony Geode Fragment

Microcrystalline Quartz (SiO2)

mineral
Chert (Iron-stained or Dark) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained or Dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary
Asphalt (Bituminous Slate/Sandstone) (Asphaltum / Bituminous Rock) — sedimentary

Asphalt (Bituminous Slate/Sandstone)

Asphaltum / Bituminous Rock

sedimentary
Chert (Arrowhead Artifact) (Chert (SiO2)) — sedimentary

Chert (Arrowhead Artifact)

Chert (SiO2)

sedimentary
Sandstone (Greywacke/Lithic Sandstone) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Greywacke/Lithic Sandstone)

Arenite (composed primarily of SiO2)

sedimentary
Chert (Jasper/Flint variety) (Microcrystalline silicon dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline silicon dioxide (SiO2)

sedimentary
Chert (Flint) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

sedimentary
Banded Siltstone or Argillite (Siltstone (primarily SiO2 with Al and Fe oxides)) — sedimentary

Banded Siltstone or Argillite

Siltstone (primarily SiO2 with Al and Fe oxides)

sedimentary
Yellow Jasper (Limonite-stained Chert) (Silicon Dioxide (SiO2) with Limonite/Goethite inclusions) — sedimentary

Yellow Jasper (Limonite-stained Chert)

Silicon Dioxide (SiO2) with Limonite/Goethite inclusions

sedimentary
Jasper (Iron-rich Chert) (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary

Jasper (Iron-rich Chert)

Silicon Dioxide (SiO2) with iron oxide impurities

sedimentary
Yellow Jasper (Chalcedony (Silicon Dioxide with Iron inclusions), SiO2) — sedimentary

Yellow Jasper

Chalcedony (Silicon Dioxide with Iron inclusions), SiO2

sedimentary
Bloodstone Jasper (Heliotrope) (SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz) — sedimentary

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

sedimentary
Red Jasper (Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

sedimentary
Septarian Nodule (Septarian Concretion (CaCO3 with Siderite and Calcite/Aragonite infusions)) — sedimentary

Septarian Nodule

Septarian Concretion (CaCO3 with Siderite and Calcite/Aragonite infusions)

sedimentary
Ferruginous Sandstone (Gozzan) (Iron-rich clastic sedimentary rock with Limonite/Goethite) — sedimentary

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

sedimentary
Yellow Jasper (Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)

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

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

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

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary
Chert (Quartz Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

sedimentary
Quartz Vein in Pelite (Metamorphic Rock) (Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)) — metamorphic

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

metamorphic
Sandstone (Quartz-rich) (Arenite (composed mainly of SiO2)) — sedimentary

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

sedimentary
Sodalite (blue beads) and Clear Quartz (clear beads) (Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2) — mineral

Sodalite (blue beads) and Clear Quartz (clear beads)

Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2

mineral
Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

mineral
Sandstone (Ferruginous) (Arenite (primarily SiO2 with iron oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

sedimentary
Petrified Wood (Silicified Wood (primarily Chalcedony or Quartz, SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

sedimentary
Chert / Flint (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Flint

Microcrystalline Quartz (SiO2)

sedimentary
Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

mineral
Clear Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Clear Quartz Crystal

Silicon Dioxide (SiO2)

mineral
Granite Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Granite Gneiss

Gneiss (High-grade metamorphic rock)

metamorphic
Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary
Glauconitic Sandstone (Glauconitic Sandstone with high Glauconite concentration ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)) — sedimentary

Glauconitic Sandstone

Glauconitic Sandstone with high Glauconite concentration ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

sedimentary
Glauconitic Sandstone (Glauconitic arenite (contains (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)) — sedimentary

Glauconitic Sandstone

Glauconitic arenite (contains (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

sedimentary
Chert (Novaculite Variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Novaculite Variety)

Microcrystalline Quartz (SiO2)

sedimentary
Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary
Green Fluorite (Fluorite (Calcium Fluoride - CaF2)) — mineral

Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

mineral
Sandstone (Ferruginous) (Arenite with Iron Oxide cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

sedimentary