Rock Identifier

Category

Sedimentary Or Metamorphic (Base Substrate)

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

Greywacke (River Pebble) (Greywacke (Indurated Sandstone)) — sedimentary

Greywacke (River Pebble)

Greywacke (Indurated Sandstone)

Fossiliferous Limestone with Rugose Coral (Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)) — sedimentary

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

Graywacke (Graywacke/Lithic Sandstone) — sedimentary

Graywacke

Graywacke/Lithic Sandstone

Fossiliferous Limestone (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Blue-Gray Chert) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Blue-Gray Chert)

Microcrystalline quartz (SiO2)

Sandstone (likely Ferruginous) (Sandstone (SiO2 with iron oxides)) — sedimentary

Sandstone (likely Ferruginous)

Sandstone (SiO2 with iron oxides)

Zebra Jasper (Opaque microcrystalline Quartz (SiO2) with impurities) — sedimentary

Zebra Jasper

Opaque microcrystalline Quartz (SiO2) with impurities

Shale (possibly Carbonaceous or Oil Shale) (Laminated Mudstone (primarily clay minerals and quartz)) — sedimentary

Shale (possibly Carbonaceous or Oil Shale)

Laminated Mudstone (primarily clay minerals and quartz)

Precious Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Precious Opal

Hydrated amorphous silica (SiO2·nH2O)

Sandstone (likely Siltstone variety) (Arenite / Siltstone (primary mineral SiO2)) — sedimentary

Sandstone (likely Siltstone variety)

Arenite / Siltstone (primary mineral SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

River Cobble (Gneiss/Schist mix) (Foliated Metamorphic Rock (Gneissic/Schistose)) — metamorphic

River Cobble (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneissic/Schistose)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Milky Quartz in Matrix (Silicon Dioxide (SiO2)) — mineral

Milky Quartz in Matrix

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Green Quartz (Prasiolite/Adventurine) (Silicon Dioxide with inclusions (SiO2)) — mineral

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide with inclusions (SiO2)

Specular Hematite (Hematite (Fe2O3)) — mineral

Specular Hematite

Hematite (Fe2O3)

Quartz (Drusy/Crystalline) (Silicon Dioxide (SiO2)) — mineral

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Citrine (SiO2 (Silicon Dioxide)) — mineral

Citrine

SiO2 (Silicon Dioxide)

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Mica (Muscovite) (Muscovite, KAl2(AlSi3O10)(OH)2) — Mineral

Mica (Muscovite)

Muscovite, KAl2(AlSi3O10)(OH)2

Fossil Coral (Rugose Coral) (Rugosa (extinct order of solitary and colonial corals)) — sedimentary

Fossil Coral (Rugose Coral)

Rugosa (extinct order of solitary and colonial corals)

Gastropod Fossil (Snail Internal Cast) (Class Gastropoda (Steinkern)) — sedimentary

Gastropod Fossil (Snail Internal Cast)

Class Gastropoda (Steinkern)

Fossilized Favosites (Honeycomb Coral) (Favosites (extinct genus of tabulate coral)) — sedimentary

Fossilized Favosites (Honeycomb Coral)

Favosites (extinct genus of tabulate coral)

Fossiliferous Shale (Laminated Mudrock with plant fossils) — sedimentary

Fossiliferous Shale

Laminated Mudrock with plant fossils

Fossilized Coral (Petoskey-like or Favosites) (Anthozoa (Fossilized Coral)) — sedimentary

Fossilized Coral (Petoskey-like or Favosites)

Anthozoa (Fossilized Coral)

Crushed Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Crushed Limestone

Sedimentary Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Fossilized Tabulate Coral (Honeycomb Coral) (Favosites (Order: Tabulata)) — sedimentary

Fossilized Tabulate Coral (Honeycomb Coral)

Favosites (Order: Tabulata)

Sandstone (Red) (Arenite (primarily Quartz, SiO2, with Iron Oxide cement)) — sedimentary

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Concrete / Conglomerate (Man-made) (Artificial Conglomerate (Cementitious Composite)) — sedimentary

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Red Sandstone (Iron-Rich) (Arenite (Fe2O3)) — sedimentary

Red Sandstone (Iron-Rich)

Arenite (Fe2O3)

Dendritic Jasper (Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions) — sedimentary

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Tumbled Carnelian and Quartz Mix (Silicon Dioxide (SiO2) with iron oxide impurities) — mineral

Tumbled Carnelian and Quartz Mix

Silicon Dioxide (SiO2) with iron oxide impurities

Gneiss (Foliated Metamorphic Gneiss) — metamorphic

Gneiss

Foliated Metamorphic Gneiss

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate (Clastic sedimentary rock (Puddingstone)) — sedimentary

Conglomerate

Clastic sedimentary rock (Puddingstone)

Rhodonite (Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Specular Hematite (on Schist/Matrix) (Hematite (Alpha-Fe2O3)) — mineral

Specular Hematite (on Schist/Matrix)

Hematite (Alpha-Fe2O3)