Rock Identifier

Category

Sedimentary (Alluvial Deposit)

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

Sandstone (likely Quartz Sandstone) (Arenite (SiO2 based)) — sedimentary

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Water and Silt (Sedimentary Environment) (Suspended Sediment / H2O (dihydrogen monoxide)) — sedimentary

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Chert (variations include Flint or Jasper) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Cryptocrystalline Quartz (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (with Iron Staining) (Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)) — sedimentary

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Red Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Petrified Wood (Silicified wood (Quartz variant, SiO2)) — sedimentary

Petrified Wood

Silicified wood (Quartz variant, SiO2)

Chert (variations include Flint or Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)) — sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)

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

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (Arenite (primarily SiO2 with various cementing agents)) — sedimentary

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Quartz in Limonite-rich Matrix (Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O) — Mineral in Sedimentary/Secondary host

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Mineral in Sedimentary/Secondary host

Fossiliferous Limestone with Brachiopod (Phylum Brachiopoda in calcitic matrix) — sedimentary

Fossiliferous Limestone with Brachiopod

Phylum Brachiopoda in calcitic matrix

Magnetite / Iron Ore (Magnetite (Fe3O4)) — mineral

Magnetite / Iron Ore

Magnetite (Fe3O4)

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

Glauconitic Sandstone

Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

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

Sandstone (Quartzose)

Arenite (primarily SiO2)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Selenite (Satin Spar) (Gypsum (CaSO4·2H2O)) — mineral

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

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

Gneiss

High-grade metamorphic rock (Gneiss)

Carnelian (Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)) — Mineral

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)

Fossiliferous Limestone (Coquina / Shell Limestone) (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone (Glacial Cobble) (Arenite / Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

Sedimentary rock with quartz veining (Laminated siltstone or mudstone with hydrothermal quartz veins) — sedimentary

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

Chert (Basanite variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Basanite variety)

Microcrystalline Quartz (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Chert (Iron-stained) (Chert (SiO2)) — sedimentary

Chert (Iron-stained)

Chert (SiO2)

Limonite (with Goethite/Ironstone) (FeO(OH)·nH2O (Hydrated Iron Oxide)) — mineral

Limonite (with Goethite/Ironstone)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Jasper (Iron-stained Chalcedony) (SiO2 with Fe2O3 (Iron Oxide) impurities) — Sedimentary / Mineral (Silica)

Jasper (Iron-stained Chalcedony)

SiO2 with Fe2O3 (Iron Oxide) impurities

Sedimentary / Mineral (Silica)

Banded Agate (Jasper-Agate) (Silicon Dioxide (SiO₂)) — Mineral

Banded Agate (Jasper-Agate)

Silicon Dioxide (SiO₂)

Rough Amber (likely Copal or immature Amber) (Organic gemstone / Succinite (if Baltic)) — mineral

Rough Amber (likely Copal or immature Amber)

Organic gemstone / Succinite (if Baltic)

Gneiss with Quartz Veining (Gneiss (High-grade regional metamorphic rock)) — metamorphic

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

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

Hematite

Iron(III) oxide (Fe2O3)

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

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

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

Quartz (Milky/Common variant)

Silicon Dioxide (SiO2)

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

Geode (Quartz)

Silicon Dioxide (SiO2)

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Precious Opal (Hydrated Silica (SiO2·nH2O)) — mineral

Precious Opal

Hydrated Silica (SiO2·nH2O)

Red Jasper (Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2) — mineral

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2

Agate Geode (Cryptocrystalline Quartz (SiO2)) — mineral

Agate Geode

Cryptocrystalline Quartz (SiO2)