Polished fossiliferous limestone pebble
Fossiliferous micritic limestone, chiefly calcite (CaCO₃)
sedimentary
Category
Sedimentary Or Igneous Fragment
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Weathered fossiliferous limestone
Calcitic limestone, predominantly calcium carbonate (CaCO₃), possibly containing shell or coral fossil fragments
sedimentary
Conglomerate
Clastic sedimentary rock (composed mostly of SiO2)
sedimentary
Coprolite
Fossilized Feces
sedimentary
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Fossil Coral
Scleractinia or Anthozoa (Fossilized)
fossil
Magnetite / Ironstone
Iron(II,III) oxide (Fe3O4)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Fossilized Wood / Petrified Wood
Petrified Wood (Silicified Flora)
fossil
Orange Calcite
Calcite (CaCO3)
Mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Sandstone
Clastic Sedimentary Rock
sedimentary
Celestite
Celestine (Strontium Sulfate, SrSO4)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Jasper Agate (specifically Brecciated Jasper)
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Chert (Field Pebble)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
Igneous
Sandstone Cobble
Arenite (Sandstone)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Brecciated quartz-rich rock, possibly silicified breccia
Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining
sedimentary
Milky Quartz in Conglomerate Matrix
Silicon Dioxide (SiO2) within Clastic Sedimentary Rock
sedimentary
Calcite-rich limestone
Limestone, primarily calcite (CaCO₃), possibly fossiliferous or dolomitic
sedimentary
Fossiliferous Limestone with Brachiopod Mold
Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions
sedimentary
Banded Sandstone
Quartz Arenite (with iron oxide banding)
sedimentary
Sandstone
Arenite
Sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Biotite Schist
Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Fossilized Dinosaur Bone
Perineralized Bone (Fluorapatite/Quartz replacement)
fossil
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Green Sandstone Pebble (River/Beach Pebble)
Glauconitic Sandstone
sedimentary
Sandstone (with Iron Staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Sandstone (Quartz Sandstone / Iron-stained Sandstone)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Sandstone
Arenite
sedimentary