Sedimentary (Imitation)

Banded Sandstone (Zebra Stone)

Arenite with Iron Oxide Banding (Liesegang rings)

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Jasper

SiO2

Shale

Mudrock / Fissile Shale

Sandstone

Clastic sedimentary rock (primarily 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)

Chert (Jasper)

Silicon Dioxide (SiO2)

Likely weathered sandstone or iron-stained sedimentary rock

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

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

Red Jasper (Polished)

Jasper (Iron-rich Microcrystalline Quartz, SiO2)

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

Chert (Chert Nodule with Chalky Cortex)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Orange Calcite (Cleavage Rhomb)

Calcite (Calcium Carbonate, CaCO3)

Manganese Ore (Psilomelane/Pyrolusite)

Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Green Opal

Hydrated Silica (SiO2·nH2O)

Red Claystone / Mudstone

Argillaceous sedimentary rock

Conglomerate

Conglomerate Sedimentary Rock

River Stone (Sandstone or Siltstone)

Sedimentary Rock (Clastic)

Stromatolite

Biogenic sedimentary rock

Sandstone (Banded)

Sedimentary Clastic Rock

Sandstone

Clastic Sedimentary Rock

Sandstone

Clastic Sedimentary Rock

Conglomerate / Breccia Matrix (Aggregated Rock)

Sedimentary Breccia / Conglomerate

River Pebble (Siltstone / Fine-grained Sandstone)

Sedimentary Pebble (Siliclastic)