Weathered sandstone pebble
Sandstone, likely quartz-rich (arkose or quartz arenite)
sedimentary
Category
Sedimentary (Anthropogenic)
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Weathered gray sandstone or siltstone
Clastic sedimentary rock, likely quartz–feldspar-rich sandstone/siltstone
sedimentary
Weathered limestone
Calcite-rich carbonate rock (mostly CaCO₃)
sedimentary
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Chert (Tan/Yellow variety)
Microcrystalline quartz (SiO2)
sedimentary
Shale (or Mudstone)
Clay mineral aggregate / Fine-grained siliciclastic sedimentary rock
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Banded Sandstone (Zebra Stone)
Arenite with Iron Oxide Banding (Liesegang rings)
sedimentary
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Chert (Jasper/Opaline variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or igneous host
sedimentary
Sandstone
Sedimentary Clastic Rock
sedimentary
Limestone Nodules or Chert
Sedimentary rock fragment
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Rounded ironstone concretion
Iron-oxide-cemented sandstone or siltstone concretion, commonly hematite/goethite-bearing
sedimentary
Weathered fine-grained rock, likely mudstone or siltstone
Indeterminate clastic sedimentary rock; likely lithified clay- and silt-sized grains
sedimentary
Red sandstone
Quartz-rich sandstone, commonly ferruginous (Fe-oxide stained)
sedimentary
Sandstone (Sedimentary Concretion/Disk)
Arenite (predominantly SiO2)
sedimentary
Fossilized Shell Fragment
Invertebrate marine fossil, likely calcium carbonate replacement
fossil
Painted Garden Rock
Coated Siltstone or Mudstone
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Caribbean Calcite
Calcium Carbonate with Argonite (CaCO3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Black Opal (Triplet)
Hydrated Silica (SiO2·nH2O)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Fossilized Bone
Fossilized vertebrate bone
fossil
Bivalve Seashell Fossil
Class Bivalvia
fossil
Fossiliferous Sandstone (with Quartz patch)
Sedimentary Sandstone with Silicified Shell Fragments
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sedimentary Outcrop (Sandstone/Shale)
Sedimentary bedrock formation (variable composition)
sedimentary
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in calcitic matrix
sedimentary
Lepidodendron Fossil in Sandstone
Lepidodendron (Lycophytina, Lepidodendrales)
sedimentary
Fossil shells and a fossil tooth
Likely fossilized marine bivalves (possibly cockles or ark clams) and a shark tooth; exact species is not identifiable from the image
fossil
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