Sandstone (Greywacke)
Arenite / Wacke (SiO2 + varied clasts)
sedimentary
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
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Banded Chert (or Banded Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron Oxide cement (Fe2O3 / FeO(OH))
sedimentary
Sandstone Concretion
Sandstone (Sedimentary rock, mostly SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Fossil Coral (Petoskey Stone or similar)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Quartz-rich limestone or calcitic marble
Calcite (CaCO₃), possibly with quartz (SiO₂)
metamorphic
Jasper
Silicon Dioxide (SiO2)
sedimentary
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Fossilized Oyster Shell
Gryphaea or Exogyra (Family Ostreidae)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)
Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining
metamorphic
Banded sandstone pebble
Quartz-rich sandstone (predominantly quartz, with feldspar and iron-oxide cement)
sedimentary
Sandstone (likely Siltstone or Mudstone variety)
Clastic Sedimentary Rock (primarily SiO2 with iron oxides)
sedimentary
Red Jasper
Silicon dioxide (microcrystalline quartz), SiO2
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Zebra Jasper
Silicified sedimentary rock (SiO2) with mineral inclusions
sedimentary
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and other mineral inclusions
mineral
Magnetite (Small Granule)
Magnetite (Fe3O4)
mineral
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
River Pebble (Siltstone / Fine Sandstone)
Sedimentary Rock (siliciclastic clastic rock)
sedimentary
Petrified Wood
Silicified Wood (Per mineral content: SiO2, Quartz/Chalcedony)
fossil
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Weathered limestone or calcareous sandstone
Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃), possibly fossiliferous limestone
sedimentary
Sandstone (with Laminations)
Clastic sedimentary rock (primarily Quartz-based)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
sedimentary
Rounded river pebble, likely quartz-rich sandstone or quartzite
Indeterminate quartz-rich clast; predominantly SiO₂
sedimentary/metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Yellow Jasper
Jasper (variety of Quartz - SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Banded iron formation fragment (likely jasper-rich ironstone)
Banded iron formation (BIF), commonly hematite/goethite with chert or jasper; Fe₂O₃/FeO(OH) and SiO₂
sedimentary
Likely pale limestone or calcite-rich rock
Calcite-bearing limestone; chiefly calcium carbonate (CaCO₃)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony replacing $SiO_2$)
sedimentary
Banded Sandstone (River Cobble)
Arenite Sandstone with heavy mineral layering
sedimentary
Jasper (Green Jasper/River Stone)
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper (River pebble)
Jasper / Silicon Dioxide (SiO2)
sedimentary