Sedimentary (Biogenic Sediment Or Biological Remain)

Chert (Flint/Jasper variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and mineral impurities

Fossiliferous Sedimentary Rock (Coquina/Limestone)

Fossiliferous Calcarenite / Bioclastic Limestone

Bumblebee Jasper

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

Echinoid Fossil (Sea Urchin Fossil)

Echinoidea (phylum Echinodermata), often preserved as Calcite (CaCO3)

Pebble

Clast (specifically a granule or small pebble)

Red Sandstone Pebble

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 staining)

Kambaba Jasper

Stromatolite (Microbial mat fossil in silicified sediment)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Calamites (Fossilized Horsetail)

Calamites suckowii (Family: Calamitaceae)

Wishing Stone (Quartz-veined Siltstone or Graywacke)

Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)

Banded Iron Formation (BIF)

Banded Iron Formation

Yellow Jasper

Chalcedony (Silicon Dioxide, SiO2)

Gastropod Fossil (Snail Internal Mold)

Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)

Sandstone

Arenite (SiO2 based clastic rock)

Fossilized Sand Tiger Shark Tooth

Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)

Petrified Wood

Silicified wood (Quartz, SiO2)

Jasper

Silicon dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Fossilized Coral (Honeycomb Coral)

Favosites (extinct genus of tabulate corals), CaCO3 (Calcium Carbonate)

Chert Pebble / Brachiopod Fossil Internal Mold

Silicon Dioxide (SiO2) / Fossil: Brachiopoda (generic internal mold)

Petrified Wood

Silicified Wood (SiO2)

Red Jasper (Skull Carving)

Jasper (Silicon Dioxide, SiO2 plus Iron Oxide inclusions)

Jasper (Mookaite variety likely)

Silicon Dioxide (SiO2) with iron oxide inclusions

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Petrified Wood

Silicified Wood (SiO2)

Red Jasper

Jasper (a variety of Quartz, SiO2)

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

River Rock (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock

Conglomerate

Conglomerate (clastic sedimentary rock)

Pyrite

Iron Sulfide (FeS2)

Chalk

Calcium Carbonate (CaCO3)

Petrified Wood

Silicon Dioxide (SiO2) permineralized organic matter

Fossilized Wood (with Coal and Limonite)

Petrified Wood (Silicified or Carbonized Flora)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz

Petrified Wood

Silicified Wood (SiO2)

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony