Anthropogenic (Man Made Material Mimicking Sedimentary Rock)

Red Sandstone

Arenite (primarily Quartz with Iron Oxide)

Sandstone

Arenite

Sandstone

Arenite (primarily Quartz Arenite)

Sandstone

Arenite (SiO2 based)

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Sandstone

Sandstone (clastic sedimentary rock)

Sandstone

Arenite (composed primarily of SiO2)

Chert

Sedimentary cryptocrystalline quartz (SiO2)

Laterite (Iron-rich bauxite or Gossan)

Ferricrete (Fe2O3·nH2O)

Red jasper in gray host rock (likely hematite-stained quartzite or rhyolite)

Jasper: microcrystalline quartz (SiO₂), with iron-oxide coloration; exact host uncertain from image

Chert (Flint Nodules)

Chert (Silicon Dioxide, SiO2)

Sandstone

Clastic sedimentary rock (primarily quartz arenite)

Sandstone (Ferruginous / River-worn Cobble)

Sandstone (SiO2 with iron oxide impurities)

Decorative polished pebbles

Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt

Sandstone

Arenite

Sandstone

Arenite (predominantly SiO2 quartz grains)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone

Arenite (SiO2 based with cement)

Shale

Clastic Sedimentary Rock

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)

Metaconglomerate

Metaconglomerate (Quartzite conglomerate)

Slag (Industrial Byproduct)

Ferro-silicate glass (Slag)

Sea Glass (Uranium/Vaseline Glass variant)

Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)

Sandstone

Arenite (primarily composed of SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock)

Iron Slag

Ferrous Slag (complex silicate and oxide byproduct)

Limestone (Grey and White specimens)

Calcium Carbonate (CaCO3)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite

Sandstone

Arenite (SiO2 based)

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Silica (SiO2)