Mineral, Sediment

Greenish chert or serpentine-rich rock

Likely microcrystalline quartz (SiO₂), possibly with chlorite/serpentine inclusions

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide inclusions

Likely tumbled brown stone

Indeterminate; possibly jasper, chert, or iron-stained quartzite

Tumbled red jasper

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

Likely red jasper or iron-rich chert fragments

Microcrystalline quartz (SiO₂), colored by hematite/goethite; exact identification requires testing

Quartz (Yellow/Citrine variety)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Quartz Pebble (Grit)

Silicon Dioxide (SiO2)

Mica-rich schist (likely biotite schist)

Biotite–quartz–feldspar schist; mica is chiefly biotite, K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Weathered basalt pebble

Basalt, a fine-grained mafic volcanic rock; likely olivine- and pyroxene-bearing

Fossil bone fragment

Fossilized vertebrate bone; exact taxon undetermined

Chert (likely flint)

Microcrystalline quartz, SiO₂ (chalcedony-rich chert)

Likely weathered brown stone, possibly iron-rich sandstone or chert

Indeterminate from image; possible ferruginous sandstone (quartz + iron oxides) or iron-rich chert

Tumbled, weathered limestone or calcareous concretion

Calcite-rich limestone; predominantly calcium carbonate (CaCO₃)

Polished orbicular jasper

Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions

Rounded quartz-rich pebble, likely milky quartz

Quartz (SiO₂), possibly weathered quartzite or chalcedony

Botryoidal chalcedony geode

Microcrystalline quartz (SiO₂), commonly with drusy quartz and iron-oxide staining

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Rounded limestone pebble

Limestone, predominantly calcite (CaCO₃)

Polished breccia (decorative stone)

Likely carbonate breccia: angular carbonate-rock fragments in a calcite-rich matrix; exact identification requires testing

Fossiliferous limestone with a shell fossil

Calcite-rich limestone (primarily CaCO₃), containing a likely fossil shell

Fossil tooth, likely shark tooth

Fossilized selachian tooth, possibly Carcharodon or a related lamniform shark

Polished fossil shell fragment

Likely fossilized bivalve shell; mineralized aragonite/calcite (exact taxon indeterminate)

Fossilized marine shell fragment

Likely a bivalve or gastropod shell preserved as calcite (CaCO₃)

Fossilized bivalve shell fragment

Bivalvia; commonly aragonite or calcite (CaCO₃), often recrystallized during fossilization

Fossilized trilobite

Trilobita; likely an enrolled asaphid or phacopid trilobite

Sandstone concretion (Ironstone-stained)

Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)

Siderite Concretion (Nodule)

Iron Carbonate (FeCO3) Concretion

Ironstone Concretion

Siderite or Hematite-bonded Concretion

Concretion in Shale

Siltstone/Shale with Siderite or Calcareous concretions

Banded chert or flint

Microcrystalline quartz (SiO₂), likely with iron-oxide and dark organic/mineral impurities

Shale

Lutaceous sedimentary rock

Petrified Wood

Silicified wood (primarily Silicon Dioxide - SiO2)

Dark shale or mudstone

Fine-grained siliciclastic sedimentary rock, chiefly clay minerals and quartz

Fossilized shell or coral fragment

Indeterminate marine mollusk or colonial coral fossil; likely calcite/aragonite replaced by calcite (CaCO₃)

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. et sp. indet.

Petrified Wood

Silicon Dioxide (SiO2) - Calcified / Silicified Wood

Tumbled jasper or weathered chert

Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide impurities

Polished brecciated jasper (likely picture jasper)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions

Likely tumbled red mineral or glass imitation

Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony

Quartz-bearing mica schist (probable)

Mica schist composed chiefly of quartz and biotite/muscovite mica