Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Iron-Stained Quartzite

Recrystallized Meta-Quartzite (primarily SiO2)

Chert (Brown variety)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Limestone

Calcium Carbonate (CaCO3)

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)

Bumblebee Jasper

Calcite with Arsenic and Manganese oxides (technically a volcanic rock)

Chert (Arrowhead Fragment)

Chert / Microcrystalline Silicon Dioxide (SiO2)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Fossiliferous Limestone

Limestone with fossil inclusions (CaCO3)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Rock Salt (Halite)

Halite (Sodium Chloride, NaCl)

Moqui Marble (Iron Concretion)

Iron Oxide Concretion (Goethite/Hematite Cemented Sandstone)

Quartz (Specifically Clear to Smoky Quartz point)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Chertified Limestone)

Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Banded Agate (specifically Carnelian Agate color)

Silicon Dioxide (SiO2) - variety of Chalcedony

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)

Copper-bearing Mica Schist

Mica Schist with Native Copper inclusions

Ironstone Concretion (likely)

Goethite/Hematite/Limonite cemented sediment

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz / Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (and Chalcedony)

Microcrystalline Quartz (SiO2)

Granitic Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)

Chert (with Liesegang Banding)

Microcrystalline quartz (SiO2)

Quartz (with iron oxide staining)

Silicon Dioxide (SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Chert (White/Light Tan)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Agate (specifically Sardonyx)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Chert

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Green Calcite (often commercially called Green Onyx)

Calcium Carbonate (CaCO3)

Chert / Quartz Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Honey Calcite

Calcium Carbonate (CaCO3)