Sedimentary Or Mineral

Limonite / Ironstone

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Banded gneiss

Foliated gneiss, likely quartz–feldspar–mica gneiss

Geode Nodule Fragment

Quartz / Chalcedony Nodule

Magnetite or Ironstone Nodule

Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule

Apatite

Ca5(PO4)3(F,Cl,OH)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Pyrite

Iron Disulfide (FeS2)

Sandstone

Clastic sedimentary rock (primarily quartz arenite)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)

Siltstone Pebble with Veining

Siltstone

Sandstone

Arenite

Pyrite

Iron Sulfide (FeS2)

Galena

Lead Sulfide (PbS)

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)

Banded river pebble

Likely banded sandstone or siltstone; exact identification requires testing

Sandstone (Weathered Fragment)

Clastic Sedimentary Rock

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Sedimentary Pebble

Sedimentary Rock Fragment

Sandstone

Arenite

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Rhodochrosite

Manganese Carbonate (MnCO3)

Polished fossil-bearing shale or mudstone

Fossiliferous carbonaceous mudstone/shale; visible fossils may be bivalves or ammonites, but species cannot be confirmed from the image

Banded sandstone

Quartz-rich sandstone (quartz arenite or feldspathic sandstone; exact type cannot be determined from the image)

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Shale / Mudstone

Laminated Mudrock (Siliciclastic Sedimentary Rock)

Blue Calcite

Calcite (Calcium Carbonate, CaCO3)

Selenite / Gypsum

Gypsum (CaSO4·2H2O)

Shale / Mudstone

Sedimentary rock (Claystone / Mudstone / Shale)

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

Banded Sedimentary Rock

Sedimentary rock with Liesegang banding

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

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.

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Sandstone

Arenite (SiO2 dominant)

Sandstone (Ferruginous)

Clastic sedimentary rock (SiO2 with Fe2O3)

Sandstone (Quartz-rich)

Arenite (SiO2)

Sandstone

Clastic Sedimentary Rock

Sandstone (Tumbled / Rounded)

Sedimentary Rock (Quartz arenite)

Sandstone

Clastic Sedimentary Rock

Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)

Anhydrite (Calcium Sulfate, CaSO4)