Mineral, Sediment

Possibly biotite-rich mica schist or weathered mafic rock

Mica schist; chiefly biotite mica, quartz, and feldspar

Chalcedony (likely carnelian/agate beads or rounded grains)

Microcrystalline quartz, SiO₂; chalcedony varieties

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz or quartz-rich vein material

Weathered quartz-rich rock fragment

Likely milky quartz–bearing quartzite or silica-rich chert; exact identification requires testing

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Fossil bivalve shell

Fossilized mollusk (Bivalvia), likely an oyster or clam; exact genus requires locality and diagnostic features

Fossilized bone fragment

Mineral-replaced vertebrate bone, commonly apatite [Ca₅(PO₄)₃(F,OH,Cl)]

Shale with Coprolite influence

Argillaceous sedimentary rock (Shale/Mudstone)

Shale or Mudstone River Pebble

Argillaceous sedimentary rock

Yellow jasper (likely ocean jasper or brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) with iron-oxide staining and dark mineral veins

Brown shale or mudstone fragment

Likely fissile claystone/shale, composed mainly of compacted clay minerals, quartz, and minor iron oxides

Fossilized Gastropod Internal Mold

Steinkern (Mollusca: Gastropoda)

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Orange chert or jasper fragment

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing jasper

Amber with dark mineral/organic inclusions

Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood (SiO2 - Silicon Dioxide)

Fossilized turtle shell fragment

Testudines indeterminate; shell bone permineralized with silica/carbonate minerals

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃), with a visible fossil shell or fossil fragment

Concretion with Geode Cavity

Ferruginous Sandstone Concretion with Quartz Center

Petrified Wood

Silicified Wood (SiO2)

Weathered fossil shell fragment

Likely a bivalve or gastropod shell, composed mainly of biogenic calcite/aragonite (CaCO₃)

Iron-stained quartz/chert pebble

Microcrystalline quartz (SiO₂) with iron-oxide minerals, chiefly goethite/limonite

Fossilized bivalve shell

Molluscan bivalve fossil; shell originally composed of calcium carbonate (aragonite/calcite, CaCO₃)

Fossilized shell or bone fragment

Indeterminate biogenic calcite or apatite fossil

Sandstone Concretion (Omar or Nut Rock)

Sedimentary Concretion (specifically an 'Omarolluk' or Omar)

Fossil Shark Tooth

Chondrichthyes dentition (Fossilized Tooth)

Mica-rich schist (likely quartz–muscovite schist)

Quartz–muscovite schist; commonly composed of quartz (SiO₂), muscovite mica, and possibly feldspar

Polished fossil tooth, likely shark tooth

Likely fossilized shark tooth; exact taxon cannot be determined from this image

Dark rounded river cobble, likely basalt

Basalt (fine-grained mafic volcanic rock; commonly plagioclase + pyroxene ± olivine)

Weathered granite or granitic gneiss

Coarse felsic granitoid, chiefly quartz, feldspar, and biotite/hornblende

Trilobite fossil

Fossilized trilobite; exact genus/species indeterminate

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Petrified Wood

Silicified Wood (SiO2)

Ironstone concretion (likely a hematite-rich nodule)

Ferruginous ironstone concretion; iron oxides/hydroxides, chiefly hematite (Fe₂O₃) and/or goethite (FeO(OH))

Fossilized Shark Tooth (Megalodon or Carcharocles fragment)

Elasmobranchii (Fossilized tooth root / crown section)

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. indet.

River Rocks (Polished River Pebbles)

Stream-rounded clastic sediments

Tumbled banded sandstone pebble

Quartz-rich sandstone (lithified siliciclastic sediment)

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely brecciated and iron-oxide-rich

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)