Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Category
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
Shale or Slaty Mudstone
Argillaceous sedimentary rock
Pyrite in Shale
Iron Disulfide (FeS2)
Shale
Fissile Siliciclastic Sedimentary Rock
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
Chert (Yellow/Tan Variety)
Chert (SiO2)
Gastropod Fossil (Snail Steinkern)
Class Gastropoda fossil, composed of Calcium Carbonate (CaCO3)
Gneiss
High-grade metamorphic rock (Gneiss)
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide cement)
Sandstone (Ferruginous)
Arenite (Fe2O3 rich)
Sandstone (Greywacke/Siltstone variant)
Arenite / Wacke (SiO2 with diverse mineral inclusions)
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
Chert (Field Stone/Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Siltstone or Mudstone
Argillaceous sedimentary rock
River Pebble (Quartz/Jasper)
Silicon Dioxide (SiO2)
Weathered Sandstone with Algae Growth
Arenite
Greywacke (likely)
Greywacke (a type of sandstone)
Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
Sandstone (likely Arkosic)
Clastic Sedimentary Rock
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Fossilized Shark Tooth in Matrix
Otodus sp. (likely Otodus obliquus)
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
Chert (Jasper)
Microcrystalline Quartz (SiO2) with iron oxide impurities
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
Sandstone (Greywacke)
Arenite / Clastic Sedimentary Rock
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
Blue Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO₂)
Fossiliferous Sandstone (with Brachiopod or Bivalve mold)
Clastic Sedimentary Rock with Macrofossil Mold