Rock (Likely Sedimentary)

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Tumbled gray stone, likely serpentinite or weathered basalt

Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph

Felsic Igneous Rock (likely Rhyolite or weathered Granite)

Felsic Volcanic/Plutonic Rock

Basalt with Quartz Vein and Weathering Crust

Amygdaloidal or Porphyritic Basalt

Quartz Crystal

Quartz (SiO₂)

Conglomerate

Conglomerate (Detrital Sedimentary Rock)

Porphyry (likely Porphyritic Andesite or Basalt)

Porphyritic Igneous Rock

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Basalt with Quartz/Calcite Veining

Aphanitic Mafic Basalt with secondary mineral veining

Chert/Jasper

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Weathered limestone fragment

Calcite-rich limestone, primarily calcium carbonate (CaCO₃)

Banded Chert

Silicon dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with fossil inclusions

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Tumbled agate (likely Botswana or fortification agate)

Microcrystalline quartz, SiO₂ (chalcedony with banded impurities)

Demitasse Granite (Diorite-Granite transition)

Intermediate Plutonic Rock (Granodiorite/Diorite mix)

Chert (Flint with Iron Staining)

Silicon Dioxide (SiO2)

Fossilized Shell in Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartz Cobble (River Rock)

Silicon Dioxide (SiO2)

Banded Rhyolite

Rhyolite (High-silica volcanic rock)

Andesite

Andesite (Intermediate Extrusive Igneous Rock)

Fossil Shark Tooth (Cretaceous white shark type)

Squalicorax (commonly known as Crow Shark)

Obsidian (Arrowhead Lithic Tool)

Obsidian (Amorphous Volcanic Glass / SiO2 + inclusions)

Fossilized Shark Tooth

Elasmobranchii fossil (likely Odontaspididae family)

Fossil Shell

Phylum Mollusca (Bivalvia or Brachiopoda)

Granite Pebble

Intrusive Igneous Rock

Chert with Druzy Quartz Geode

Microcrystalline Quartz (SiO2)

Crystalline limestone (marble-like calcite rock)

Calcite, CaCO₃; likely recrystallized limestone (marble)

Coarse-grained granite or granitic pegmatite

Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole

Yellow or Honey Quartz

Silicon Dioxide (SiO2)

Fossilized Shark Tooth

Bioapatite (Calcium Hydroxyapatite) replacement

Conglomerate

Conglomerate (Sedimentary Rock)

Weathered brown stone, likely sandstone or iron-stained granite

Indeterminate; possible quartz-rich sandstone (quartz, feldspar, iron oxides)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Chert (specifically Jasper/Flint pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Common Chert)

Microcrystalline Quartz (SiO2)

Quartz-rich breccia or vein quartz with iron staining

Microcrystalline to crystalline SiO₂, likely quartz with iron oxides/hydroxides and altered host rock

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Weathered granite-like rock

Granite, likely biotite-bearing; exact identification is uncertain from the image

Blue-dyed banded agate

Microcrystalline quartz (SiO₂), chalcedony variety