Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Biogenic Sediment Or Biological Remain) in the encyclopedia
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Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Brecciated stone pebble
Breccia
sedimentary
Shale and Pebble Fragment
Sedimentary Rock (Mudstone/Shale with Silica Pebble)
sedimentary
Lepidodendron Fossil in Sandstone
Lepidodendron (Lycophytina, Lepidodendrales)
sedimentary
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Fossilized Shark Tooth in Matrix
Otodus sp. (likely Otodus obliquus)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Fossil bivalve shell
Fossilized or partially mineralized bivalve; exact genus cannot be determined from the image
fossil
Anthracite Coal
Anthracite (Carbon Content: 86%-97%)
metamorphic
Fossiliferous Sandstone with Plant Remains
Arenite with Carbonaceous impressions (likely Paleozoic/Mesozoic Flora)
sedimentary
Fossil Shark Teeth (likely Sand Tiger Shark)
Carcharias taurus (fossilized dentition)
fossil
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Aragonite
Aragonite (CaCO3)
mineral
Red Veined Jasper
Silicon Dioxide with Hematite inclusions (SiO2)
sedimentary
Jasper (Cream/Yellow variety)
Silicon dioxide (SiO2)
sedimentary
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Chert Nodules (with Gryphaea or Shell inclusions)
Microcrystalline Quartz (SiO2) with Calcitic inclusions
sedimentary
Zebra Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Fossilized Gastropod Shell
Gastropoda (Class)
sedimentary
Black Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Rounded brown sandstone or weathered river cobble
Likely quartz-rich sandstone; exact identification requires a fresh surface and tests
sedimentary
Coquina or Fossiliferous Sandstone
Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)
sedimentary
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Jasper (Beaded Necklace)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
River Cobble (Mixed Lithology)
Clastic Sedimentary Rock (Silicified Siltstone or Wacke)
sedimentary
Graywacke (River Cobble)
Graywacke (Lithic Sandstone)
sedimentary
Yellow Jasper
Tectosilicates (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Fossilized Tabulate Coral (Honeycomb Coral)
Favosites (Order: Tabulata)
sedimentary
Greywacke
Greywacke sandstone
sedimentary
Calamites (Fossil)
Calamites sp. (Tracheophyta, Equisetopsida)
sedimentary
Bivalve Fossil (Internal Mold)
Bivalvia (Phalladomya or similar genus)
fossil
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Hematite
Hematite (Α-Fe2O3)
mineral
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Banded Sandstone
Clastic Sedimentary Rock (Quartz Arenite)
sedimentary
Banded sandstone pebble
Lithic or quartz-rich sandstone; exact composition requires testing
sedimentary
Banded Chert with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Ironstone Concretion
Siderite or Hematite-rich Concretion (FeCO3 / Fe2O3)
sedimentary