Mineral, Sediment

Ironstone Concretion (Pot Stone)

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Sandstone Concretion

Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)

Picture Jasper (specifically Biggs or Deschutes variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Polychrome Jasper

Silicon Dioxide (SiO2) with impurities

Cream River Jasper

Silicified microcrystalline quartz (SiO2)

Tumbled brown jasper pebble

Jasper, microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide)

Banded Sandstone / Siltstone

Sedimentary Rock (Quartzose Sandstone / Siltstone)

Banded iron formation fragment (likely hematite–magnetite ironstone)

BIF; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica as microcrystalline quartz (SiO₂)

River Rock (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock

Tektite (Indochinite)

Tektite (High-silica impactite glass)

Fossilized Shark Tooth or Bone Fragment

Vertebrate Fossil (likely Carcharodon or similar genus)

Fossilized Wood (Petrified Wood)

Silicified Wood (primarily quartz/chalcedony replacing organic matter)

Fossil Shark Tooth

Elasmobranchii (Lamniformes order likely)

Mixed Crushed Stone

Aggregate (varied mineral composition)

Fossil Shark Tooth

Phylum Chordata, Class Chondrichthyes (Possibly Cretalamna or Otodus)

Chert Nodule in Limestone

Microcrystalline Silica (SiO2) within Calcium Carbonate (CaCO3)

Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)

Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining

Petrified Wood

Silicified Wood (SiO2)

Shale or Mudstone

Argillaceous sedimentary rock

Petrified Wood

Silicified Wood (SiO2)

Jasper (Picture Jasper variety)

Silicon Dioxide (SiO2) with impurities

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled blue-gray stone beads, likely labradorite or dyed quartz

Probable labradorite (plagioclase feldspar; approximately NaAlSi₃O₈–CaAl₂Si₂O₈), though exact identification requires testing

Amber

Succinite (a common variety of fossilized resin)

Fossilized Gastropod Internal Mold

Gastropoda (Steinkern fossil)

Tumbled banded sandstone pebble

Quartz-rich sandstone (chiefly SiO₂), likely iron-oxide-stained

Possible basalt or iron-rich concretion

Basaltic rock, likely composed mainly of plagioclase and pyroxene; exact identification requires testing

Polished fossilized ammonite or nautiloid shell

Ammonoidea or Nautiloidea; originally aragonitic shell, commonly replaced by calcite or chalcedony

Concretion

Calcareous/Siliceous Concretion

Sandstone (with Laminations)

Clastic sedimentary rock (primarily Quartz-based)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Petrified Wood

Silicified Wood / Chalcedony (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

Garnet-bearing metamorphic rock, likely mica schist

Biotite–garnet schist; commonly includes quartz, feldspar, biotite, and almandine garnet

Pyrite in Matrix (Fool's Gold)

Iron Sulfide (FeS2)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Ruby (Raw Corundum)

Corundum (Al2O3) with Chromium traces

Red jasper

Jasper (microcrystalline quartz, SiO₂), iron-oxide-rich variety

Tumbled orange jasper or iron-rich chert

Microcrystalline quartz (SiO₂), colored by iron oxides

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂)