Rock Identifier

Category

Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)

Browse sedimentary rock (specifically a concretion or possibly a geode) specimens identified by the Rock Identifier community.

Learn about Sedimentary Rock (Specifically A Concretion Or Possibly A Geode) in the encyclopedia

Geode

Septarian Concretion

Septarian Concretion

Asphalt Rock

Rock Gypsum

Conglomerate

Breccia

Ironstone

Limestone

Claystone

Phosphorite

Chert

Coal

Amethyst (SiO2 (Silicon Dioxide with iron impurities)) — mineral

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Agate Geode (Unopened) (Cryptocrystalline Quartz (SiO2) with Chalcedony) — mineral

Agate Geode (Unopened)

Cryptocrystalline Quartz (SiO2) with Chalcedony

Quartz (Druzy or Crystalline) (Silicon Dioxide (SiO2)) — mineral

Quartz (Druzy or Crystalline)

Silicon Dioxide (SiO2)

Chalcedony (specifically Agate or Carnelian) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (specifically Agate or Carnelian)

Silicon Dioxide (SiO2)

Weathered quartz-rich stone, possibly fossiliferous limestone (Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock) — sedimentary

Weathered quartz-rich stone, possibly fossiliferous limestone

Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock

Clear Quartz (Rock Crystal) (Crystalline Silicon Dioxide (SiO2)) — gemstone

Clear Quartz (Rock Crystal)

Crystalline Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2) within a sedimentary or igneous host) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) within a sedimentary or igneous host

Geode / Agate Nodule (Silicon Dioxide (SiO2)) — mineral

Geode / Agate Nodule

Silicon Dioxide (SiO2)

Weathered chert or silicified limestone nodule (Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing) — sedimentary

Weathered chert or silicified limestone nodule

Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing

Geode (Quartz / Chalcedony nodule) — sedimentary

Geode

Quartz / Chalcedony nodule

Limonite Geode / Ironstone Concretion with Quartz (Limonite with Quartz (FeO(OH)·nH2O + SiO2)) — sedimentary

Limonite Geode / Ironstone Concretion with Quartz

Limonite with Quartz (FeO(OH)·nH2O + SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Concretion (Septarian concretion (likely containing Calcite or Siderite)) — sedimentary

Concretion

Septarian concretion (likely containing Calcite or Siderite)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Conglomerate (Conglomerate (Sedimentary Clastic Rock)) — sedimentary

Conglomerate

Conglomerate (Sedimentary Clastic Rock)

Chalcedony with Quartz Crystals (Silicon Dioxide (SiO2)) — mineral

Chalcedony with Quartz Crystals

Silicon Dioxide (SiO2)

Rounded iron-rich pebble, possibly weathered laterite or ironstone (Ironstone/lateritic ferricrete; predominantly goethite–hematite with clay and quartz impurities) — sedimentary

Rounded iron-rich pebble, possibly weathered laterite or ironstone

Ironstone/lateritic ferricrete; predominantly goethite–hematite with clay and quartz impurities

Quartz Geode (Silicon Dioxide (SiO2) within a geode) — mineral

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Iron-rich rock or Concretion (Ironstone or Limonite concretion) — sedimentary

Iron-rich rock or Concretion

Ironstone or Limonite concretion

White quartz geode (Quartz, silicon dioxide (SiO₂), likely a druzy quartz geode) — mineral

White quartz geode

Quartz, silicon dioxide (SiO₂), likely a druzy quartz geode

Sandstone (Graywacke) (Clastic Sedimentary Rock (Lithic Sandstone)) — sedimentary

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Quartz Geode with Calcite (Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)) — mineral

Quartz Geode with Calcite

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)

Concretion (Siderite or Ironstone Concretion) — sedimentary

Concretion

Siderite or Ironstone Concretion

Septarian Nodule (Galt) (Calcareous concretion / Septarian concretion) — sedimentary

Septarian Nodule (Galt)

Calcareous concretion / Septarian concretion

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Moqui Marble (Ironstone Concretion (Goethite/Hematite layered over Sandstone)) — sedimentary

Moqui Marble

Ironstone Concretion (Goethite/Hematite layered over Sandstone)

Limestone (specifically Travertine or Tufa) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)

Quartz-rich geode or vuggy quartz rock (Quartz (SiO₂), likely with minor iron oxides and possibly calcite or feldspar) — mineral

Quartz-rich geode or vuggy quartz rock

Quartz (SiO₂), likely with minor iron oxides and possibly calcite or feldspar

Weathered volcanic rock, likely altered basalt/andesite (Fine-grained mafic to intermediate volcanic rock; possible chlorite–calcite alteration) — igneous

Weathered volcanic rock, likely altered basalt/andesite

Fine-grained mafic to intermediate volcanic rock; possible chlorite–calcite alteration

Concretion (Sandstone) (Sandstone Concretion) — sedimentary

Concretion (Sandstone)

Sandstone Concretion

Limonite Geode (Ironstone Concretion) (Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior) — sedimentary

Limonite Geode (Ironstone Concretion)

Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior

Quartz Geode with Chalcedony (Silicon Dioxide (SiO2) in Geode Form) — sedimentary

Quartz Geode with Chalcedony

Silicon Dioxide (SiO2) in Geode Form

Sandstone (Arenite (specifically sublithic or quartz arenite)) — sedimentary

Sandstone

Arenite (specifically sublithic or quartz arenite)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone Geode (Ironstone Concretion) (Arenite with Limonite/Hematite matrix (SiO2 with Fe-oxides)) — sedimentary

Sandstone Geode (Ironstone Concretion)

Arenite with Limonite/Hematite matrix (SiO2 with Fe-oxides)

Limestone (specifically Grainstone or Micrite) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

Weathered limestone or calcitic fossil/reef fragment (Calcite-rich limestone (CaCO₃), possibly fossiliferous limestone) — sedimentary

Weathered limestone or calcitic fossil/reef fragment

Calcite-rich limestone (CaCO₃), possibly fossiliferous limestone

Concretion (Calcareous or ferruginous concretion) — sedimentary

Concretion

Calcareous or ferruginous concretion

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

Milky Quartz Geode or Druzy Quartz

Silicon Dioxide (SiO2)