Metamorphic (Likely Gneiss Or Schist Based On Texture)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Limonitic Gossan

Goethite/Limonite aggregate after sulfide

Basalt with Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (primarily Plagioclase and Pyroxene)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Cloudy Variety)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limestone

Calcium Carbonate (CaCO3)

Apatite

Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Rhyolite

Rhyolite

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Pink Chalcedony (Agate/Jasper blend)

Silicon Dioxide (SiO₂)

Fossiliferous Limestone

Calcareous biomicrite / Calcium Carbonate (CaCO3)

Quartz Pebble

Silicon Dioxide (SiO2)

Granodiorite (Gneissic Pebble)

Granodiorite displaying minor foliation

Chert (often called Flint or River Pebble)

Chert (Microcrystalline Quartz, SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily SiO2)

Granodiorite Pebble

Granodiorite

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Sandstone (River Rock)

Arenite (composed primarily of SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Sandstone (Quartz-rich)

Arenite (composed primarily of SiO2)

Quartz Vein (Iron-stained)

Silicon Dioxide (SiO2) with limonite/hematite staining

Chert (often called Flint when dark or worked)

Cryptocrystalline silica (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Basalt with Quartz Vein and Weathering Crust

Amygdaloidal or Porphyritic Basalt

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Sandstone (likely Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Demitasse Granite (Diorite-Granite transition)

Intermediate Plutonic Rock (Granodiorite/Diorite mix)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)