Sedimentary (If Natural Jasper) Or Artificial (If Slag)

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Orange Calcite

Calcium Carbonate (CaCO3)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Red Jasper (possibly Red Coral or dyed Howlite)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Jasper (Petrified Wood variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Yellow Jasper

Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions

Asphalt Concrete

Bituminous conglomerate

Coquina

Bioclastic Limestone (Coquina)

Chalk

Calcium Carbonate (CaCO3)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Blue Chalcedony (likely dyed)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Sandstone (Quartzose)

Arenite (primarily SiO2)

Jasper and Quartz River Cobble

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Sandstone (Quartzose)

Sandstone (clastic sedimentary rock, primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Amber

Succinite (fossilized tree resin)

Yellow Jasper

Silicon Dioxide with Iron inclusions (SiO2)

Red Jasper

Jasper (Silicon Dioxide: SiO2 with Iron oxide inclusions)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz (likely Herkimer Diamond style)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide with Iron inclusions (SiO2 + Fe2O3)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Iron Ore (Limonite and Hematite)

Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)

Shale

Shale (composition varies: primarily clay minerals and quartz)

Green Fluorite (likely synthetic or heat-treated for jewelry)

Calcium Fluoride (CaF2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Sandstone (likely Quartzose)

Arenite (primarily SiO2)

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Ironstone Concretion (Pot Stone)

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Coquina

Coquina (Bioclastic Limestone)

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 primary composition)