Rock Identifier

Category

Sedimentary Or Metamorphic (Base Substrate)

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

Learn about Sedimentary Or Metamorphic (Base Substrate) in the encyclopedia

Sard

White Obsidian

Conglomerate

Quartzite Sandstone

Quartzite Sandstone

Metabasalt

Eulysite

Breccia

Hornfels

Ironstone

Anthracite

Metaquartzite

Slate

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

River Pebble (Basalt / Greywacke) (Stream-rounded fine-grained rock (Basalt / Metagreywacke)) — sedimentary

River Pebble (Basalt / Greywacke)

Stream-rounded fine-grained rock (Basalt / Metagreywacke)

Sapphire (Corundum variety) (Sapphire (Al₂O₃)) — Mineral

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

River Stone (likely Siltstone or fine-grained Quartzite) (Sedimentary clastic rock containing SiO2 and iron oxides) — sedimentary

River Stone (likely Siltstone or fine-grained Quartzite)

Sedimentary clastic rock containing SiO2 and iron oxides

River Stone (Chalcedony/Jasper variety) (Microcrystalline Quartz (SiO2)) — sedimentary

River Stone (Chalcedony/Jasper variety)

Microcrystalline Quartz (SiO2)

River Stone (Basalt or Siltstone with banding) (Polished Basaltic or Siliciclastic River Cobble) — igneous or sedimentary

River Stone (Basalt or Siltstone with banding)

Polished Basaltic or Siliciclastic River Cobble

igneous or sedimentary

Iron-stained weathered rock (Unknown) — Unknown (likely sedimentary or metamorphic)

Iron-stained weathered rock

Unknown

Unknown (likely sedimentary or metamorphic)

River Pebble (Weathered Sedimentary Rock Fragment) — sedimentary

River Pebble

Weathered Sedimentary Rock Fragment

Quartzite (River Pebbles) (Metamorphosed Sandstone (SiO2)) — metamorphic

Quartzite (River Pebbles)

Metamorphosed Sandstone (SiO2)

Mixed River Pebbles (Polymictic quartz and silicate pebble aggregate) — sedimentary

Mixed River Pebbles

Polymictic quartz and silicate pebble aggregate

Mixed River Pebbles (Polylithic rock fragments) — sedimentary

Mixed River Pebbles

Polylithic rock fragments

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

Yellow Jasper (Chert variant)

Silicon Dioxide (SiO2) with iron oxide inclusions

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

Fossiliferous Limestone (Coral Rag)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebble (Siltstone / Sandstone Pebble) (Sedimentary Rock (Quartz, Feldspar, Clay Minerals)) — sedimentary

River Pebble (Siltstone / Sandstone Pebble)

Sedimentary Rock (Quartz, Feldspar, Clay Minerals)

River Pebble (Gneiss or Quartzite variant) (Course-grained Metamorphic Rock (likely SiO2 dominant)) — metamorphic

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

River Pebbles (Polymictic Lithic Pebbles) — sedimentary

River Pebbles

Polymictic Lithic Pebbles

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Polished Stone Pendant (Identity Unclear) (Unknown (Possibly Jasper/Agate/Quartz mixture)) — mineral

Polished Stone Pendant (Identity Unclear)

Unknown (Possibly Jasper/Agate/Quartz mixture)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Yellow Quartzite River Pebbles (Metamorphic Silicon Dioxide (SiO2) with iron oxide inclusions) — metamorphic

Yellow Quartzite River Pebbles

Metamorphic Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz Pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Tumbled dark pebble (Indeterminate; likely basalt or fine-grained dark metamorphic rock) — mineral

Tumbled dark pebble

Indeterminate; likely basalt or fine-grained dark metamorphic rock

Sapphire (Corundum (Al2O3)) — gemstone

Sapphire

Corundum (Al2O3)

Quartz Pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebble / Chert Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

River Pebble / Chert Pebble

Microcrystalline Quartz (SiO2)

Expanded Clay Pebble (Lightweight Expanded Clay Aggregate (LECA)) — sedimentary

Expanded Clay Pebble

Lightweight Expanded Clay Aggregate (LECA)

White Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

Petoskey Stone (Hexagonaria percarinata (Fossilized Rugose Coral)) — sedimentary

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Moss-covered Rock Fragment (Weathered Rock Fragment with Epilithic Growth) — sedimentary

Moss-covered Rock Fragment

Weathered Rock Fragment with Epilithic Growth

River Stone (Basalt or Siltstone) (Mafic Volcanic Rock or Clastic Sedimentary Rock) — igneous or sedimentary

River Stone (Basalt or Siltstone)

Mafic Volcanic Rock or Clastic Sedimentary Rock

igneous or sedimentary

Red coral (coral beads) (Precious coral, usually Corallium spp.; composed primarily of calcium carbonate (calcite)) — gemstone

Red coral (coral beads)

Precious coral, usually Corallium spp.; composed primarily of calcium carbonate (calcite)

Potassium-Rich Silicate Clay (inferred from biological context) (Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)) — mineral

Potassium-Rich Silicate Clay (inferred from biological context)

Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)

Jasper pebble (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper pebble

Silicon Dioxide (SiO2) with impurities

Tufa (Calcareous Tufa (Calcium Carbonate, CaCO3)) — sedimentary

Tufa

Calcareous Tufa (Calcium Carbonate, CaCO3)

River Stone (Limestone) (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

River Stone (Limestone)

Sedimentary Calcium Carbonate (CaCO3)

Fossilized Bored Limestone (Limestone with Ichnofossils (Gastrochaenolites or Entobia)) — sedimentary

Fossilized Bored Limestone

Limestone with Ichnofossils (Gastrochaenolites or Entobia)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Quartzite Pebble (Metamorphosed Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Sandstone (SiO2)

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Aragonite (Sputnik habit) (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Aragonite (Sputnik habit)

Aragonite (Calcium Carbonate, CaCO3)