Mineral, Sediment

Fossil tooth, possibly shark tooth

Indeterminate fossilized vertebrate tooth; likely a shark tooth (possibly *Carcharhinus* or related genus)

Grooved Maun Ball (Maul/Hammerstone-like Concretion)

Calcareous/Ferruginous Concretion in Sandstone Matrix

Sandstone (Arkose)

Arkose Sandstone (SiO2 with KAlSi3O8)

Coarse Sand and River Gravel

Siliciclastic Sediment (primarily Quartz and Feldspar)

Small rounded tan pebble, likely quartz-rich river stone

Indeterminate; possibly quartz or quartzite (predominantly SiO₂)

Mixed beach gravel and sand

Unsorted siliciclastic sediment, chiefly quartz and rock fragments

Jasper Marble

Silicon Dioxide (SiO2) with Impurities

Ironstone Concretions (Ironstone)

Ferruginous Sandstone or Siltstone (Fe2O3)

Fossilized gastropod (likely nerite or related sea snail)

Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite

Rounded gray river pebble

Likely fine-grained quartz-rich sandstone or siltstone; exact identification requires a fresh surface and tests

Reddish-brown weathered rock (specific type uncertain)

Possibly iron-oxide-stained sandstone or siltstone; image alone is insufficient for a firm identification

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Rhodochrosite

Manganese Carbonate (MnCO3)

Gravel and Pebbles

Unconsolidated rock fragments (clastic sediment)

Likely ironstone pebble

Iron-rich concretion, probably goethite/limonite cementing sediment; exact identification is uncertain from the photograph

Fossilized Shell or Coral Fragment in Matrix

Invertebrate Fossil in Sedimentary Rock

Fossilized Shark Tooth

Chondrichthyes (Class)

Weathered stone nodule or concretion

Unidentified lithic concretion; composition cannot be determined from the image

Fossil brachiopod or bivalve shell fragment

Likely a fossilized, ribbed brachiopod; exact genus/species cannot be determined from the image

Bivalve Fossil (Shell-bearing Sedimentary Rock)

Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Green sea glass (likely bottle glass)

Man-made soda–lime silicate glass; not a natural mineral

Sandstone (Iron-stained)

Arenite with Limonite/Hematite staining

Vivianite

Vivianite, Fe2+3(PO4)2·8H2O

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

Gravel and Pebbles

Unconsolidated rock fragments / detrital sediment

Quartz Sand Gravel

Silicon Dioxide (SiO2)

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

Milky quartz vein fragment

Quartz (silicon dioxide, SiO₂)

Clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (SiO₂), likely translucent white variety

White quartz pebble

Quartz (SiO₂), likely massive milky quartz

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Tumbled milky quartz

Quartz, SiO₂

Fossil-bearing Sedimentary Rock

Sedimentum cum fossili

Sandstone

Arenite (primarily composed of SiO2)

Pyrite-bearing rock, likely pyrite schist or phyllite

Quartz–mica-rich metamorphic rock with disseminated pyrite (FeS₂); exact rock type cannot be confirmed from the image

Ironstone Concretion

Ironstone (Limonite/Goethite/Hematite mixture)

Siltstone Concretion

Carbonate-cemented Siltstone Concretion

Sandstone (Gneissic or Banded)

Clastic Sedimentary Rock (composed predominantly of SiO2)

Banded Chert / Cryptocrystalline Quartz

Silicon Dioxide (SiO2)

Bivalve Fossil (Clam Stone)

Phylum Mollusca, Class Bivalvia