Anthropogenic (Human Made) Sedimentary Like Material

Red Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)

Petrified Wood

Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)

Green Fluorite

Calcium Fluoride (CaF2)

Coquina / Fossiliferous Limestone

Calcite-rich Bioclastic Sedimentary Rock (CaCO3)

Chert (Jasper/Flint variation)

Chert (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide SiO2)

Petrified Wood

Silicified Wood (SiO2 permineralization)

Chert (often called Flint or River Stone)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Siltstone or Mudstone

Argillaceous sedimentary rock

Precious Opal

Hydrated Silica (SiO2·nH2O)

Brachiopod Fossil in Limestone

Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)

Dyed Crackle Quartz (Green)

Quenching-treated Quartz (Silicon Dioxide, SiO2)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Green Chert

Microcrystalline Quartz (SiO2)

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pyrite

Iron Disulfide (FeS2)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Jasper Breccia

Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Chert (specifically Tan/Brown Chert)

Chert (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Coquina / Shell Limestone

Coquina (Bioclastic Limestone)

Obsidian

Obsidian (volcanic glass)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

River Siltstone Pebble

Siltstone (primarily composed of silica and clay minerals)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Chert (specifically Tan Chert or Flint)

Silicon Dioxide (SiO2)

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Jasper

Silicon dioxide (SiO2) with impurities

Chert (often called Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Siltstone

Siltstone (siliciclastic sedimentary rock)

Chert (Field Stone)

Chert (Silicon Dioxide, SiO2)

Chert (and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Septarian Nodule Segment (Turtle Stone)

Septarian Concretion (CaCO3 with Siderite or Calcite infill)

Fossilized Brachiopod

Phylum Brachiopoda (replaced by Calcite/CaCO3)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)