Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Category
Sedimentary (Base), Then Artificial
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Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Pebble)
Arenite
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Limestone Gravel
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)
Elasmobranchii (fossil remains)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sandstone (lithic wake/graywacke variety)
Arenite/Greywacke (SiO2 with lithic fragments)
sedimentary
Gravel/Common Siltstone
Siltstone (fine-grained siliciclastic sedimentary rock)
sedimentary
Anthracite Coal
Anthracite (Carbon based)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Tumbled yellow jasper or chert
Microcrystalline quartz (SiO₂), likely iron-oxide-stained chalcedony/chert
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Breccia Pebble
Sedimentary Breccia
sedimentary
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Grey River Pebble (Likely Quartz-rich or Limestone)
Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)
sedimentary
White flint or chert flake
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (or Flint)
Chert (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Iron-rich chert or jasper fragment
Microcrystalline quartz (SiO₂), colored by iron oxides/hydroxides
sedimentary
Polygenetic Conglomerate (Puddingstone)
Conglomerate (SiO2 matrix with mixed clasts)
sedimentary
Pyrite Concretion (Grapestone)
Iron Sulfide (FeS2) Concretion
sedimentary
Fossilized Sea Urchin Spines
Echinoidea (Cidaroid spines)
sedimentary
Sandstone (Calcareous/Lithic)
Sedimentary Rock (Clastic Sandstone with Calcium Carbonate cement)
sedimentary
Sandstone
Arenite (primary component SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Dalmatian Jasper
Peralkaline rhyolite with arfvedsonite inclusions
igneous
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Granite
Granite (Phaneritic Igneous Rock)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Conglomerate
Clastic Sedimentary Conglomerate (SiO2 based clasts in matrix)
sedimentary
White Onyx (Marble Onyx)
Calcite (CaCO3) - Banded Calcium Carbonate
sedimentary
Sandstone, Quartzite, and River Pebbles
Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures
Sedimentary and Metamorphic