Shale
Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)
sedimentary
Category
Sedimentary Rock (Metamorphosed)
Browse sedimentary rock (metamorphosed) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Metamorphosed) in the encyclopedia
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Sandstone (Water-worn pebble)
Arenite (primarily SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone
Arenite
sedimentary
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Small red-brown mineral or rock fragment
Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide
mineral
Sandstone
Arenite (predominantly SiO2 with iron oxides)
sedimentary
Coal
Bituminous or sub-bituminous coal (carbonaceous rock)
sedimentary
Fossil Coral
Tabulate Coral (potentially Favosites or Calapoecia)
fossil
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Sandstone Pebble
Sandstone (Silicon dioxide-rich clastic sedimentary rock)
sedimentary
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Chert
Chert (Microcrystalline Quartz)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (predominantly SiO2 quartz grains)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Sandstone Anvil / Nutting Stone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary
Pink Granite
Phaneritic Quartz-Feldspar Plutonic Rock
igneous
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Fossil Shark Tooth
Selachii (fossilized dentition)
fossil
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Iron-rich rock or Concretion
Ironstone or Limonite concretion
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (SiO2 with Fe2O3)
sedimentary
Sandstone Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide enriched sedimentary rock)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert / Flint Arrowheads
Cryptocrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Concretion
Sedimentary Concretion
sedimentary
Sandstone
Arenite
sedimentary
Travertine (or Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Quartz-veined Sedimentary Rock
Sedimentary rock with hydrothermal quartz veins
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral