Rock Identifier

Category

Sedimentary (Alluvial Deposit)

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

Septarian Nodule (Siderite or Calcite Concretion) — sedimentary

Septarian Nodule

Siderite or Calcite Concretion

Petoskey Stone (Fossilized Rugose Coral) (Hexagonaria percarinata (Calcium Carbonate, CaCO3)) — sedimentary

Petoskey Stone (Fossilized Rugose Coral)

Hexagonaria percarinata (Calcium Carbonate, CaCO3)

Coquina (Biogenic Limestone (Calcitic shells)) — sedimentary

Coquina

Biogenic Limestone (Calcitic shells)

Jasper with Quartz Veining (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Chert (White Chert/Flint) (Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (White Chert/Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Coquina (Bioclastic Limestone) — sedimentary

Coquina

Bioclastic Limestone

Puddingstone (Conglomerate (typically quartz-rich or jasper-rich)) — sedimentary

Puddingstone

Conglomerate (typically quartz-rich or jasper-rich)

Coquina (Bioclastic Limestone) — sedimentary

Coquina

Bioclastic Limestone

Sandstone (likely Arkose or Quartz Sandstone) (Arenite (SiO2 principal component)) — sedimentary

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Chert (and Petrified Wood) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and Petrified Wood)

Silicon Dioxide (SiO2)

Chert (specifically Flint) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Bumblebee Jasper (Fossiliferous Calcite containing Orpiment and Realgar) — sedimentary

Bumblebee Jasper

Fossiliferous Calcite containing Orpiment and Realgar

Celestine (or Celestite) (Strontium sulfate (SrSO4)) — mineral

Celestine (or Celestite)

Strontium sulfate (SrSO4)

Brick (Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)) — Man-made material (constructed)

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Man-made material (constructed)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Kyanite (Purple variety) (Kyanite (Al₂SiO₅)) — metamorphic

Kyanite (Purple variety)

Kyanite (Al₂SiO₅)

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

Chert (Flint variety)

Silicon Dioxide (SiO2)

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

Chert / Flint

Silicon Dioxide (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Jasper (likely Lake Superior Jasper) (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper (likely Lake Superior Jasper)

Jasper (Silicon Dioxide, SiO2)

Red Jasper (Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2) — sedimentary

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2

Red Sandstone (Arenite (Fe2O3-rich)) — sedimentary

Red Sandstone

Arenite (Fe2O3-rich)

Carnelian (Carnelian (Silicon Dioxide - SiO2)) — mineral

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Banded Sandstone (Wonderstone) (Sandstone with Liesegang Rings (SiO2 with Iron Oxides)) — sedimentary

Banded Sandstone (Wonderstone)

Sandstone with Liesegang Rings (SiO2 with Iron Oxides)

Chert (varietal: Flint/River Pebble) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (varietal: Flint/River Pebble)

Cryptocrystalline Quartz (SiO2)

Chert (and/or Flint) (Chert (Cryptocrystalline variety of Quartz, SiO2)) — sedimentary

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

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

Quartz Druzy Geode

Silicon Dioxide (SiO2)

River Stone (Granitic Gneiss) (Foliated Granitic Gneiss) — metamorphic

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Limonite (Iron Ore) (FeO(OH)·nH2O (Hydrated Iron Oxide)) — mineral

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Goethite (likely as part of Limonite/Ironstone) (Goethite (α-FeOOH)) — Mineral

Goethite (likely as part of Limonite/Ironstone)

Goethite (α-FeOOH)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Chalcedony (Agate/Carnelian) (Cryptocrystalline Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Carnelian)

Cryptocrystalline Silicon Dioxide (SiO2)

Turquoise (set in silver jewelry) (Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)) — mineral

Turquoise (set in silver jewelry)

Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Sandstone (Arenite (Siliclastic sedimentary rock)) — sedimentary

Sandstone

Arenite (Siliclastic sedimentary rock)

Red Jasper (Skull Carving) (Jasper, a cryptocrystalline variety of Quartz (SiO2)) — sedimentary

Red Jasper (Skull Carving)

Jasper, a cryptocrystalline variety of Quartz (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

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

Jasper

Jasper (Silicon Dioxide, SiO2)

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

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

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

Yellow Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Chert (containing Flint and Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (containing Flint and Chalcedony)

Microcrystalline Quartz (SiO2)