Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
Learn about Anthropogenic (Man Made Material Mimicking Sedimentary Rock) in the encyclopedia
View all →
Coquina or Fossilized Shell Fragment
Calcium Carbonate (CaCO3) / Biogenic Limestone
sedimentary
Fossilized Gastropod Steinkern
Class Gastropoda internal mold
fossil
Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
fossil
Clear Quartz crystals on a Matrix base (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Mica Schist
Schist (Mica-rich Metamorphic Rock)
metamorphic
Chert (Yellow/Brown Jasper)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
fossil
Chert / Jasper / Agate (Chalcedony Group)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Nut-stone / Cup-stone artifact)
Quartz Arenite / Worked Sedimentary Rock
sedimentary
Gneiss
Metamorphic Rock (Gneissic texture)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone Pebble (River Rock)
Sandstone (Quartz-rich sedimentary rock with iron oxide staining)
sedimentary
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)
fossil
Fossil Coral
Rugosa or Tabulata coral fossil (Calcite/Silica replacement)
fossil
Red Sandstone
Clastic Sedimentary Rock (typically contains Quartz and Iron Oxide)
sedimentary
Sandstone (Red Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Jasper Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron Oxide Impurities
sedimentary
Tufa
Calcareous Tufa (Calcium carbonate, CaCO3)
sedimentary
Hardened Gray Mudstone
Argillite / Silicified Mudstone (principally SiO2 and Al2Si2O5(OH)4)
sedimentary
Sandstone (specifically Cross-bedded Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Water-worn)
Arenite
sedimentary
Chert (Flint)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Banded Iron Formation (BIF) / Banded Sandstone Nodule
Hematite-rich Sandstone / Ferruginous Chert
sedimentary
Jasper and Chert Conglomerate
Ferruginous Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Seashell Fossil
Invertebrate fossil (phylum Mollusca)
fossil
Weathered iron-stained quartzite or jasper
Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and limonite
metamorphic
Garnet-bearing gneiss
Quartz–feldspar–mica gneiss with iron-rich garnet (commonly almandine)
metamorphic
Chert (Nodule)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Banded Chert / Sandstone Pebble
Microcrystalline Quartz (SiO2) / Silicified Sandstone
sedimentary
Rounded yellow-brown pebble
Likely iron-stained sandstone or quartz-rich river cobble
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary