Sedimentary

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Wood Stone (Dragon Stone variant)

Argillaceous Sedimentary Rock

River Pebble (Greywacke or Siltstone)

Clastic Sedimentary Rock

Shale or Siltstone

Sedimentary Rock (Siliciclastic)

Coal (Bituminous)

Sedimentary carbonaceous rock

Conglomerate

Clastic Sedimentary (Conglomerate)

Limestone Breccia

Sedimentary Breccia (Calcareous)

Siltstone or Mudstone

Argillaceous sedimentary rock

Shale

Lutaceous sedimentary rock

Sandstone Pebble

Sandstone (primarily SiO2)

Shale with Siltstone layering

Sedimentary Clastic Rock (Mudstone/Shale)

Shale or Siltstone

Fine-grained siliciclastic sedimentary rock

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Sandstone (lithic)

Lithic Wacke / Arenite

Weathered sandstone fragment

Quartz-rich sandstone, likely ferruginous sandstone

Ironstone (Limonite/Hematite concretion)

Ferruginous Siltstone / Goethite (FeO(OH))

Quartz-veined Sandstone

Quartzite-veined Arenite / SiO2 and quartz sand

Weathered sandstone or arkosic sandstone

Clastic sandstone, likely quartz–feldspar-rich (arkose)

Flesh-toned Siltstone

Siltstone (composed of microscopic Quartz and Feldspar grains)

Chert (Common Opal/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Jasper

SiO2

Tiny rounded metallic-looking pebble, possibly pyrite or a metal-rich mineral

Uncertain from image; possible pyrite (FeS₂), chalcopyrite (CuFeS₂), or magnetite (Fe₃O₄)

Red Jasper

Silicon Dioxide (SiO2) with Iron impurities

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Pyrite

Iron Sulfide (FeS2)

Sandstone with Quartz/Calcite druse

Arenite with druse (SiO2 or CaCO3)

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Likely weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone; exact identification is limited by the blurred photograph

Banded gneiss pebble

Gneiss, likely quartz–feldspar–biotite gneiss

Small weathered mineral/rock fragment

Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen

Blue Calcite

Calcium Carbonate (CaCO3)

Magnetite (Iron Ore)

Iron(II,III) oxide (Fe3O4)

Brown Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper and Hematite

Silicon Dioxide (SiO2) and Iron Oxide (Fe2O3)

Red Jasper or Ironstone concretion

SiO2 or Fe2O3

Aragonite Star Cluster (Cross-section)

Aragonite (Calcium Carbonate, CaCO3)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Fluorite, Turquoise, and Calcite set

Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz Geode

Silicon Dioxide (SiO2) in Host Rock

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities