Rock Identifier

Category

Sedimentary Or Metamorphic (Base Substrate)

Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.

Red Sandstone (Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)) — sedimentary

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Gravel or Crushed Stone (Fragmented Aggregate Stone) — sedimentary or igneous fragment

Gravel or Crushed Stone

Fragmented Aggregate Stone

sedimentary or igneous fragment

Sandstone (Arenite (predominantly SiO2 quartz grains)) — sedimentary

Sandstone

Arenite (predominantly SiO2 quartz grains)

Chert (White/Gray variety) (Chert (SiO2)) — sedimentary

Chert (White/Gray variety)

Chert (SiO2)

Basalt and Quartz Pebble (Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble) — igneous and sedimentary

Basalt and Quartz Pebble

Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble

igneous and sedimentary

Crushed Limestone and Calcite (Calcium Carbonate (CaCO3)) — sedimentary

Crushed Limestone and Calcite

Calcium Carbonate (CaCO3)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate (Conglomerate (Clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (Clastic sedimentary rock)

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Garnet (Almandine variety) (Almandine Garnet (Fe3Al2(SiO4)3)) — mineral

Garnet (Almandine variety)

Almandine Garnet (Fe3Al2(SiO4)3)

Slate (Slate (Metamorphic Rock)) — metamorphic

Slate

Slate (Metamorphic Rock)

Gneiss (Gneissic Metamorphic Rock) — metamorphic

Gneiss

Gneissic Metamorphic Rock

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Greywacke (Lithic Sandstone (Greywacke)) — sedimentary

Greywacke

Lithic Sandstone (Greywacke)

Graywacke Pebble (River Stone) (Graywacke (Lithic wacke)) — sedimentary

Graywacke Pebble (River Stone)

Graywacke (Lithic wacke)

Graywacke (Sandstone) (Graywacke Sandstone) — sedimentary

Graywacke (Sandstone)

Graywacke Sandstone

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

Chert / Flint

Silicon Dioxide (SiO2)

Coquina / Shelly Limestone (Coquina (calcium carbonate, CaCO3)) — sedimentary

Coquina / Shelly Limestone

Coquina (calcium carbonate, CaCO3)

Conglomerate (River Rock Aggregate) (Conglomerate (Lithic-clast conglomerate)) — sedimentary

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Chert Nodule (Commonly known as a Flint or River Cobble) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (Commonly known as a Flint or River Cobble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules) (Chert (Cryptocrystalline variety of Quartz, SiO2)) — sedimentary

Chert (Flint Nodules)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

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

Chert (variations include Chalcedony and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Chert (Basanite variety) with Quartz Vein

Microcrystalline Quartz (SiO2)

Chert (Iron-rich or Jasperoid) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-rich or Jasperoid)

Cryptocrystalline Quartz (SiO2)

Chert (and associated Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and associated Flint)

Silicon Dioxide (SiO2)

Chert (Brecciated River Cobble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Brecciated River Cobble)

Silicon Dioxide (SiO2)

Coquina (Bioclastic Limestone (composed primarily of Calcium Carbonate / CaCO3)) — sedimentary

Coquina

Bioclastic Limestone (composed primarily of Calcium Carbonate / CaCO3)

Chert (specifically Banded Chert) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Chert (Fossiliferous) (Chert (Cryptocrystalline Silica/SiO2)) — sedimentary

Chert (Fossiliferous)

Chert (Cryptocrystalline Silica/SiO2)

Fossiliferous Limestone (Calcite-rich Sedimentary Rock (CaCO3)) — sedimentary

Fossiliferous Limestone

Calcite-rich Sedimentary Rock (CaCO3)

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

Sandstone (Quartzose)

Arenite (primarily SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Slate (Foliated Metamorphic Slate) — metamorphic

Slate

Foliated Metamorphic Slate

Gneiss (with Quartzite layers) (Gneissic Metamorphic Rock) — metamorphic

Gneiss (with Quartzite layers)

Gneissic Metamorphic Rock

Conglomerate (Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)) — sedimentary

Conglomerate

Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)

Sandstone (with Iron Staining) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Ironstone (Limonitic Sandstone) (Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)) — sedimentary

Ironstone (Limonitic Sandstone)

Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)

Coquina or Fossilized Shell Fragment (Calcium Carbonate (CaCO3) / Biogenic Limestone) — sedimentary

Coquina or Fossilized Shell Fragment

Calcium Carbonate (CaCO3) / Biogenic Limestone

Ruby Zoisite (Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)) — metamorphic

Ruby Zoisite

Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)

Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Marble

Recrystallized Calcite (CaCO3)