Dendritic Agate or Manganese Nodule in Chert/Limestone
Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions
sedimentary
Category
Sedimentary (Fossiliferous)
Browse sedimentary (fossiliferous) specimens identified by the Rock Identifier community.
Red Jasper (River Stone)
Jasper (Silicon Dioxide, SiO2 plus iron oxide inclusions)
sedimentary
Blue Chalcedony
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Mineral/Semiprecious Gemstone (variety of Quartz)
Celestite (Celestine) Geode
Strontium Sulfate (SrSO4)
mineral
Stromatolite
Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)
sedimentary
Coal (Bituminous or Anthracite)
Carbonaceous sedimentary rock (primarily Carbon, C)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite or Sandstone
Sedimentary Rock
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
mineral
Sulfur (on Matrix)
Native Sulfur (S8)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 rich)
sedimentary
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
Hematite
Hematite, Iron(III) oxide (Fe2O3)
mineral
Puddingstone (Jasper Conglomerate)
Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Barite Rose on Marcasite
Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Litharenite)
sedimentary
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (often called Flint when dark)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Conglomerate
Clastic sedimentary rock (Polymictic Conglomerate)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (River Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone Pebbles
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary