Sedimentary Or Igneous Fragment

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Weathered iron-rich sandstone or laterite fragment

Ferruginous sandstone, likely hematite/goethite-cemented sandstone (exact identification requires testing)

Quartz (Crystal Point/Fragment)

Silicon Dioxide (SiO2)

Mother of Pearl (Nacre) / Shell Fragment

Biogenic Calcium Carbonate (Aragonite and Conchiolin)

Common Pebble / Sedimentary Rock Fragment

Lithified clastic sediment

Milky quartz vein fragment

Quartz (silicon dioxide, SiO₂), massive/microcrystalline variety

Basalt Breccia

Volcanic Breccia (composed of basaltic clasts in a fine-grained matrix)

Likely weathered fossil bone fragment

Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data

Sea Shell Fragment (Calcium Carbonate)

Aragonite / Calcite (CaCO3)

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

Fossiliferous Limestone

Biomicrite / Fossiliferous Limestone (CaCO3)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Likely quartz-rich rock fragment

Probably microcrystalline quartz (SiO₂), possibly a pale chert or quartzite fragment

Limestone Gravel

Sedimentary Calcium Carbonate (CaCO3)

Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)

Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Likely weathered sandstone or iron-stained quartzite fragment

Quartz-rich sandstone (predominantly SiO₂; exact identification uncertain from image)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Milky Quartz

Silicon Dioxide (SiO2)

Chalcedony (likely agate/chert variety)

Microcrystalline quartz, SiO₂

Fossiliferous Limestone (Hash)

Bioclastic Grainstone / Calcarenite

Conglomerate

Conglomerate

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Coquina

Biogenic Limestone (Calcitic shells)

Honey calcite (likely cleavage fragment)

Calcite, CaCO₃

Sea Shell (Fighting Conch Fragment)

Calcium Carbonate (CaCO3) - Strombus alatus fragment

Porphyritic polymictic breccia (likely volcanic breccia)

Volcanic breccia; probable polymictic andesite–dacite breccia with quartz/feldspar clasts

Mixed collection of common river stones

Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material

Fossilized Bone Chunk

Permineralized Vertebrate Bone (indeterminant)

Chert Breccia

Brecciated Microcrystalline Quartz (SiO2)

Conglomerate

Conglomerate (Sedimentary rock)

Fossiliferous Limestone

Biogenic Limestone (CaCO3)

Brecciated Chert

Brecciated Chert (Microcrystalline Quartz, SiO2)

Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Blue-green calcite

Calcite (CaCO₃), likely copper-bearing or otherwise inclusions-colored

Flint (chert), likely brown flint

Microcrystalline quartz/chalcedony (SiO₂)

Quartz (Smoky/Brown variety)

Silicon dioxide (SiO2)

Orange calcite fragment

Calcite (CaCO₃), likely iron-stained or orange-colored calcite

Pumice or Tuff

Pumice / Tuff

Brick fragment (Man-made material)

N/A (Fired clay)

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. et sp. indet.