Rock (Likely Sedimentary)

Mica Schist with Garnet

Garnetiferous Mica Schist

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Ferruginous Sandstone

Sandstone (arenite) with Limonite/Goethite cement

Botryoidal Chalcedony with Calcite

Chalcedony (SiO2 with accessory minerals, likely CaCO3)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Pebble (river rock/beach pebble)

Pebble (clast size class)

Druzy Quartz (part of a Geode)

Silicon Dioxide (SiO2)

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Granite Gneiss

Felsic Gneiss

Chert (Yellow/Brown Jasper)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Chert (Tan/Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Sandstone with Quartz Veining

Arenite with hydrothermal quartz (SiO2)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Chert (and its variety Flint)

Silicon dioxide (SiO2) / Microcrystalline quartz

Ironstone Concretion (Boji Stone/Moqui Marble type)

Goethite/Hematite-encrusted Sandstone Concretion

Chert (Green variety)

Silicon Dioxide (SiO2)

Sandstone (Picture Sandstone)

Sandstone (primarily Quartz with Iron Oxide impurities)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Gneiss

Gneiss (High-grade metamorphic rock)

Fossil Coral

Scleractinia (fossilized calcium carbonate)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Clear Quartz

Silicon Dioxide (SiO2)

Chert (specifically Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Ferruginous Sandstone

Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)

Banded Gneiss

Gneiss (Metamorphic Rock)

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Mica Schist

Mica Schist

Chert (Nodule)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Banded Chert with Quartz Veining

Microcrystalline Quartz (SiO2)

Sandstone Concretion

Ferruginous Sandstone Concretion

Sandstone (Quartz-rich Pebble)

Arenite (primarily SiO2)

Quartz

Silicon dioxide (SiO2)

Greenstone / Glauconitic Siltstone

Metabasalt or Glauconite-rich Sedimentary Rock

Sandstone (Ferruginous)

Arenite (Fe-rich SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Blue Lace Agate

Agate (Variety of Chalcedony, SiO2)

Ferruginous Sandstone

Arenite with Hematite/Limonite cement

Banded Gneiss

Gneiss (Metamorphic Rock)