Mineral, Sediment

Fossilized Sand Tiger Shark Tooth

Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)

Fossilized ammonite

Ammonoidea (likely a ribbed Jurassic–Cretaceous ammonite), replaced mainly by calcite or silica

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz

Petrified Wood

Silicified wood (primarily Quartz, SiO2)

Fossilized Echinoid Fragment (Calycinal/Boss Fossil)

Echinodermata fossil fragment

Concretion

Septarian Concretion (Fragmentary)

Ironstone Concretion

Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)

Greywacke

Dirty Sandstone (Lithic wacke)

Sandstone (with banding/weathering)

Clastic Sedimentary Rock (primarily SiO2)

Tumbled yellow-brown stone, likely jasper or quartzite

Undetermined; possibly microcrystalline quartz (SiO₂) in jasper or quartzite

River Cobble (Mixed Lithology)

Clastic Sedimentary Rock (Silicified Siltstone or Wacke)

Polished basalt pebble

Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase, pyroxene, olivine, and iron oxides

Fossil Shark Tooth

Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)

Quartz geode fragment

Mostly crystalline quartz (SiO₂), likely with chalcedony and minor iron-oxide staining

Weathered quartz pebble (tentative)

Quartz, SiO₂; possibly iron-stained quartz or quartz-rich rock

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Likely weathered quartz-rich rock

Probably quartz-bearing sandstone or milky quartz; exact identification requires testing

Polished brown stone, likely jasper or chert

Microcrystalline quartz (SiO₂), probable jasper/chert; identification is limited by the image

Small rounded quartz-rich pebble

Likely quartz (SiO₂), possibly iron-stained chert or quartzite

Weathered iron-rich concretion or possible meteorite

Likely limonite/goethite concretion; meteorite status unconfirmed

Likely tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), possibly colored by iron oxides

Likely iron-stained quartz/chalcedony pebble

Silicon dioxide (SiO₂), probably quartz or microcrystalline chalcedony with iron-oxide staining

Petrified Wood

Silicified Wood (SiO2)

Howlite (White Buffalo Turquoise)

Howlite (Calcium Borosilicate Hydroxide), Ca2B5SiO9(OH)5

Weathered jasper/chert nodule

Microcrystalline quartz (SiO₂), likely iron- and clay-stained jasper or chert

Weathered mica-rich metamorphic rock, likely schist

Muscovite/biotite schist with quartz and feldspar

Quartz-rich pebble (likely milky quartz)

Quartz, SiO₂

Likely gneiss pebble

Foliated quartz–feldspar gneiss, with dark biotite or amphibole

Polished red jasper pendant

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Likely polished dark pebble

Indeterminate; possibly basalt, black jasper, or a dark sulfide-rich stone

Petrified Wood

Silicified Wood (SiO2)

Fossilized tooth or jaw fragment (likely fish or reptile)

Indeterminate vertebrate bone/tooth; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)

Fossil brachiopod shell

Brachiopoda; exact genus/species indeterminate

Fossilized Shark Tooth

Chondrichthyes (Class) fossil

Sandstone Concretion

Carbonate-cemented Sandstone Concretion

Fossil-bearing rock, likely a fossilized shell or coral fragment

Unidentified calcitic fossil in a carbonate matrix (likely calcite, CaCO₃)

Chert Nodule in Limestone

Microcrystalline Silica (SiO2) within Calcium Carbonate (CaCO3)

Fossil Shark Tooth

Phylum Chordata, Class Chondrichthyes (Possibly Cretalamna or Otodus)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Sandstone (Quartzose)

Arenite (primarily SiO2)