Sedimentary (Fossiliferous)

Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)

Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates

Blue Chalcedony

Silicon Dioxide (SiO2)

Sandy Ironstone

Ferruginous Sandstone

Carnelian and White Quartz Bracelet

Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Quartz

Silicon dioxide (SiO2)

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Dendritic Agate or Tree Agate

Silicon Dioxide (SiO2) with impurities of manganese or iron oxide

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Sandstone with Magnetite and Iron Staining

Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Quartz Geode

Silicon Dioxide (SiO2) within a secondary sedimentary structure

Quartz Geode

Silicon Dioxide (SiO2) within a secondary sedimentary structure

Banded Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)

Ferruginous Sandstone (Ironstone Conglomerate fragments)

Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Conglomerate with Fossilized Shark Teeth

Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains

Siltstone with flute casts or scratch marks

Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)

Coquina / Limonite-stained Limestone

Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)

Hag Stone

Calcareous sedimentary rock (often Chert, Flint, or Limestone)

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Banded Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily Quartzite and Feldspar grains)

Sandstone (Red Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)

Conglomerate

Clastic Conglomerate (Lithic-rich)

Ironstone with Pyrite

Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Ferruginous Sandstone (Ironstone)

Ferruginous Sandstone / Limonite-cemented Quartz Sandstone

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Ironstone Concretion (Limonite/Goethite)

Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)

Dalmatian Jasper / Dalmatian Stone

Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)

Dalmatian Stone

Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)

Dalmation Stone (Dalmation Jasper)

Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)

Sandstone (with Limonite staining)

Arenite (FeOx-rich)

Chert (specifically Jasper or Flint type)

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Sandstone (likely Graywacke or Lithic Sandstone)

Arenite / Wacke (SiO2 based with lithic fragments)

Sandstone (Quartzose)

Arenite (SiO2 principal)

Sandstone (Quartzite-rich Pebble)

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)