Anthropogenic Sedimentary (Man Made)

Jasper or Chert with Quartz Vugs

Silicon Dioxide (SiO2)

Bored Siltstone (Holey Rock)

Siltstone with Pholad borings (Lithophaga/Pholadidae trace fossils)

Orthoceratid Fossil in Limestone

Orthoceras (extinct genus of Nautiloid Cephalopod)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Petrified Wood

Silicified wood (Quartz, Chalcedony, or Opal)

Red Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Picture Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Marble

Recrystallized Calcite (CaCO3) Rock

Chert (with Limestone/Dolomite host)

Microcrystalline Quartz (SiO2)

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz grains)

Jasper (yellow/cream variety)

SiO₂ (Cryptocrystalline Quartz)

Chalcedony

Silicon Dioxide (SiO2)

Kambaba Jasper

Stromatolite (Fossilized Algae)

Jasper Conglomerate

Jasperoid Conglomerate (predominantly SiO2 with iron oxide impurities)

Sandstone (Quartzite Pebble)

Arenite / Metamorphosed Sandstone (SiO2)

Chalcedony (Botryoidal Agate)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Travertine

Calcareous Tufa (CaCO3)

Red Siltstone

Siltstone (composed mainly of SiO2 and Fe2O3)

Sandstone

Arenite (primarily Quartz SiO2)

Sandstone (Ferruginous)

Arenite (with high iron oxide content)

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)

Sandstone (Ferruginous)

Arenite with Iron Oxide (Limonite/Hematite) coating

Sandstone (likely Siltstone variety)

Arenite / Siltstone (primary mineral SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Chert (Nodule)

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Chert (specifically Flint or Jasper variant)

Chert (Siliceous rock composed of microcrystalline Quartz, SiO2)

Chert

Chert (microcrystalline quartz, SiO2)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Sandstone (with garnet granules)

Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Druzy Quartz on Matrix (likely Limestone or Sandstone)

Silicon Dioxide (SiO2) with various trace impurities

Ironstone concretion / Limonitic Sandstone

Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)

Anthracite Coal

Anthracite (Carbon based)

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Chert (varietal: Flint/River Pebble)

Cryptocrystalline Quartz (SiO2)

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.