Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
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River Rock
Fluvial Cobble (typically Quartzite or Sandstone)
sedimentary
Likely polished dark stone or glassy mineral bead
Indeterminate; possibly obsidian, hematite, or a dark agate
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)
sedimentary
Fossiliferous Shale Matrix
Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments
sedimentary
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil-bearing sedimentary rock, possibly fossil wood or bone
Indeterminate silicified/carbonate fossil in sandstone or mudstone
fossil
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Chert (specifically Yellow Jasper)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Brecciated or Veined)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Chalcedony Pebble)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (predominantly SiO2 with Fe2O3)
sedimentary
Sandstone / Weathered Chert
Silicon Dioxide (SiO2) / Quartz-rich Clastic Rock
sedimentary
Chert (Flint Nodule)
Microcrystalline and Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (White Chert/Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Coquina Limestone (Fossiliferous Limestone)
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Laterite
Laterite (Ferricrete)
sedimentary
Iron-rich chert or jasper pebble
Microcrystalline quartz (SiO₂), colored by iron oxides
sedimentary
Schist
Schist (Foliated Metamorphic Rock)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Banded Chert or Agate
Silicon Dioxide (SiO2)
sedimentary
Jasper and Yellow Chert (Tumbled)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Weathered quartz-rich stone, possibly fossiliferous limestone
Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Ironstone with Limonite/Goethite coating
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)
sedimentary
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Sedimentary
Polished fossiliferous limestone
Bioclastic limestone, commonly crinoidal limestone (calcite, CaCO₃)
sedimentary
Likely weathered fossil bone fragment
Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data
fossil
Likely graphite-rich schist
Graphitic schist; chiefly graphite and quartz/mica
metamorphic
Petrified Wood
Silicified Wood (mainly Quartz/Chalcedony, SiO2)
fossil
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Iron-rich sandstone or lateritic rock
Ferruginous sandstone; predominantly quartz (SiO₂) cemented or stained by iron oxides/hydroxides
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Polished/patinated jasper slab
Microcrystalline quartz (SiO₂), commonly chalcedony with iron-oxide and clay inclusions
sedimentary
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Iron-rich concretion or weathered ironstone
Goethite–hematite limonite aggregate; commonly described as limonite or ironstone
sedimentary