Mineral, Sediment

Limonite / Ironstone Concretion

Hydrated Iron Oxide (FeO(OH)%C2%B7nH2O)

Banded sandstone pebble

Quartz-rich sandstone, likely iron-oxide- and organic/mineral-stained; exact variety uncertain

Gravel and River Pebbles

Unconsolidated rock fragments / Detrital sediment

Likely weathered pebble or mineral fragment

Indeterminate; possibly quartz-rich stone, iron-stained feldspar, or a small chert fragment

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Quartz River Pebble (Quartzite)

Metamorphic Quartzite (SiO2)

Likely chert or weathered limestone fragment

Microcrystalline quartz (SiO₂) or calcitic limestone (CaCO₃); identification is limited by the blurred image

Possible ironstone concretion or weathered mineral nodule

Iron-oxide-rich concretion, likely goethite/limonite; identification uncertain from the photo

Iron-rich weathered rock, possibly ironstone

Ironstone (composition uncertain; likely iron oxides such as goethite and limonite)

Fossilized bone fragment

Petrified vertebrate bone; mineralized hydroxyapatite replaced or infilled by silica/carbonates

Milky quartz fragment

Quartz (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Banded sedimentary rock (likely sandstone or siltstone)

Layered siliciclastic sedimentary rock; exact identification is not possible from the image alone

Fossil bivalve shell

Fossilized or mineral-replaced bivalve mollusk shell; exact genus/species requires locality and detailed morphology

Fossilized gastropod (snail)

Silicified or calcite-replaced gastropod fossil; exact genus indeterminate

Milky quartz

Quartz (silicon dioxide, SiO₂)

Rounded gray river cobble, likely basaltic-andesite or andesite

Fine-grained intermediate to mafic volcanic rock; commonly plagioclase ± pyroxene, with possible alteration minerals

Fossil fish specimen

Fossilized fish vertebrate, likely an articulated fish impression; exact taxon indeterminate

Petrified Wood

Silicified Wood (SiO2)

Rounded pebble, likely mixed lithology

Lithology uncertain; possibly a fine-grained metamorphic or volcanic rock with a quartz-rich/pink feldspar vein or inclusion

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

White chalcedony or quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly with minor calcite or feldspar

Fossilized Shark Tooth

Carcharocles sp. or similar (Fossilized Fluorapatite)

Rounded quartz-rich beach pebble

Likely milky quartz or quartzite (SiO₂)

Fossil coral (likely tabulate or colonial coral)

Fossilized colonial coral; exact genus indeterminate from the photograph

Banded Chert Pebble

Silicon Dioxide (SiO2)

Glauconitic Sandstone

Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 in Quartz Sandstone

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species cannot be determined from the image

Fossil bivalve shell

Fossilized marine bivalve; exact genus/species indeterminate from the photograph

Dark mineral nodule with white veining

Possibly a calcite-veined manganese- or iron-rich concretion; exact identification requires testing

Sandstone (Water-worn Pebble)

Clastic Sedimentary Rock (primarily SiO2)

Ironstone (iron-oxide-rich rock)

Ferruginous sandstone or ironstone; likely composed chiefly of goethite and/or limonite, with quartz and clay

Red Jasper

Silicon Dioxide (SiO2) with iron inclusions

Siltstone/Sandstone (possibly Wonderstone or Picture Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide inclusions)

Shark Tooth Fossil

Vertebrate fossilized tooth

Ironstone Concretion (Nutstone)

Ironstone (with High Limonite/Hematite Content)

Ammonite fossil

Fossilized ammonoid cephalopod; likely an ammonite such as *Ammolytoceras* or a related Jurassic–Cretaceous genus

Possible galena-bearing ore specimen

Uncertain from the image; galena is lead sulfide (PbS), but the specimen is not diagnostic

Brown chalcedony (agate-like flint/chert fragment)

Chalcedony, microcrystalline quartz (SiO₂); identification is tentative from the photo

Green Aventurine

Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Sandstone with Quartz Vein

Arenite with Crystalline Silica (SiO2)