Igneous, Sedimentary, Metamorphic, Mineral, Gemstone, Fossil, Or Meteorite

Tektite (likely Indochinite)

Tektite (high-silica impact glass)

Tumbled basalt (vesicular volcanic stone)

Basalt, a fine-grained mafic volcanic rock composed chiefly of plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Concretion

Calcareous/Siliceous Concretion

Quartz

Silicon dioxide (SiO2)

Sandstone Concretion

Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)

Likely iron-rich meteorite or hematite-rich rock

Uncertain; possible iron meteorite (Fe–Ni alloy) or limonite/goethite-bearing hematite

Quartz Crystal Cluster / Quartzite

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Apatite

Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)

Limonite Concretion

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

Limonite Concretion (Goonie or Rattlestone)

Limonite (FeO(OH)·nH2O)

Stream cobbles and gravel

Unidentified mixed fluvial clasts; likely quartzite, sandstone, and igneous/metamorphic fragments

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Likely quartz-rich stone or shell fragment

Uncertain; possibly quartz (SiO₂) or a calcareous shell fragment (CaCO₃)

Quartz

Silicon Dioxide (SiO2)

Citrine

SiO2 (Silicon Dioxide)

Weathered limestone or calcareous tufa

Calcite-rich carbonate rock, primarily CaCO₃ (often micritic limestone or travertine/tufa)

Small rounded pebble, likely quartz-rich sandstone or granitoid fragment

Uncertain; probable quartz/feldspar-bearing lithic pebble

Quartz Crystal

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz Crystal

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Fossilized bivalve shell or shell-rich limestone

Likely an indeterminate fossil mollusk; calcite/aragonite (CaCO₃), possibly preserved in limestone

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Shatter Cone

Impactite (Shatter Cone texture)

Sandstone Concretion

Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)

Ironstone Concretion

Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)

White Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Ironstone Concretion (Boxwork)

Siderite-Limonite Concretion (FeO(OH)·nH2O)

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)

Quartz Crystal

Silicon Dioxide (SiO2)

Sandstone Concretion

Ferruginous Sandstone Concretion

Ironstone Concretion

Ironstone (Siderite/Limonite/Goethite)

Sandstone Concretion

Arenaceous concretion (primarily SiO2 with Fe2O3 staining)

Quartz

Silicon Dioxide (SiO2)

Ironstone (Limonite/Hematite concretion)

Ferruginous Siltstone / Goethite (FeO(OH))

Tektite (Indochinite)

Tektite (Natural silica glass)

Fossiliferous limestone, likely coral or shell-rich fragment

Calcite (CaCO₃), commonly bioclastic limestone containing fossilized marine organisms

Clear Quartz

Silicon Dioxide (SiO2)

Ironstone Concretion

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