Conglomerate
Clastic sedimentary rock (Polymictic Conglomerate)
sedimentary
Category
Sedimentary (Biogenic)
Browse sedimentary (biogenic) specimens identified by the Rock Identifier community.
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Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
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)
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Sandstone
Arenite (Sandstone)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (likely Quartz Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (within Limestone)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Banded Slate (Sedimentary Pebble)
Slate (Metamorphosed Shale or Mudstone)
metamorphic
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Sandstone
Arenite (primarily Quartz-rich sedimentary rock)
sedimentary
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 (Weathered Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Hematite, Iron(III) oxide (Fe2O3)
mineral
Limestone (Beach Pebble)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
Sedimentary
Limestone (Weathered Aggregate)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary vugs
sedimentary
River Stone (River Rock)
Smooth Clastic Sedimentary Rock
sedimentary
Chert (often called Flint when dark)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
mineral
Chert with Chalcedony/Quartz Vug
Cryptocrystalline Silica (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Siltstone
Siltstone
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Ironstone Concretion
Siderite or Hematite-rich Concretion (FeCO3 / Fe2O3)
sedimentary