Man Made Rock (Sedimentary Analogue)

Red Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Sandstone with Manganese Dendrites

Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)

Sandstone

Arenite (primarily composed of SiO2)

Sandstone (River Cobble)

Clastic Sedimentary Rock (primarily Quartz with Feldspar)

Limestone (Decorative Gravel)

Calcium Carbonate (CaCO3)

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Sandstone (River Rock)

Arenite (composed primarily of SiO2)

Chert with Quartz Veining

Microcrystalline Silica (SiO2)

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)

Limestone with Stylolites

Calcareous sedimentary rock (CaCO3)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2

Pebble (Likely Basalt or Siltstone)

Clastic sedimentary rock or mafic volcanic rock

Sandstone

Sandstone (Quartz-rich sedimentary rock)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (SiO2 principal)

Shale

Laminated Mudstone

Chert / Flint

Microcrystalline quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based sedimentary rock)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Quartzite Conglomerate

Conglomerate (SiO2 rich)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)

Limestone (specifically Chalky Limestone)

Calcium Carbonate (CaCO3 / Calcite)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Ironstone Concretion (Ironstone Gourd)

Limonite/Goethite Concretion (FeOO(H))

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Banded sandstone pebble

Quartz-rich lithic sandstone; exact provenance and composition require testing

Fossilized Gastropod Shell

Gastropoda (Class)

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

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Stromatolite

Biogenic sedimentary rock / Stromatolite

Sandstone

Sedimentary Rock (Quartz Arenite)