Anthropogenic Material

Slate

Slate (Foliated metamorphic rock)

Tumbled tiger’s eye

Quartz (SiO₂) with fibrous riebeckite/crocidolite inclusions

Chrysoprase-bearing serpentine (probable)

Serpentine-group minerals, mainly lizardite/antigorite, with possible nickel-bearing chrysoprase or green garnierite

Shark Tooth Fossil Matrix

Carcharocles / Otodus species embedded in sedimentary matrix

Shark Tooth Fossil

Chondrichthyes fossilized tooth

Fossil Shark Tooth

Chondrichthyes (class)

Likely a small rough mineral specimen

Unidentifiable from the image; possibly a mica-bearing rock or green mineral

Engineered Quartz

Engineered Stone (primarily SiO2)

Concrete with Aggregate

Artificial Conglomerate (Cement and Aggregate)

Shark Tooth Fossil

Otodus megalodon

Clear gemstone earring (likely cubic zirconia)

Cubic zirconia (synthetic zirconium dioxide, ZrO₂); identification from the image is uncertain

Rounded beach pebbles, likely quartz-rich

Unidentified lithic pebbles; possibly quartzite or quartz-rich sandstone

Red goldstone beads

Goldstone (man-made copper-bearing glass; not a natural mineral)

Goldstone

Aventurine Glass (Man-made)

Ferruginous Sandstone (Ironstone Conglomerate fragments)

Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)

Zebra Jasper

Tetragonal Silicon Dioxide (Quartz) with impurities

Fossil Shark Tooth

Chondrichthyes (tooth)

Fossil Shark Tooth

Chondrichthyes teeth

Tiny metallic-looking mineral or rock fragment

Unidentifiable from the image; possibly a small metallic mineral grain

Fossilized Shark Tooth

Selachimorpha fossil

Chert / Flint

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Granitic Gravel and Soil

Regolith / Alluvial sediment

Green cabochon, likely dyed or imitation material

Undetermined; the image is insufficient to identify a mineral species

Red coral (coral beads)

Precious coral, usually Corallium spp.; composed primarily of calcium carbonate (calcite)

Brown botryoidal chalcedony (likely iron-stained agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Fossiliferous Sandstone / Fossil Fragment

Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material

Serpentinite with carbonate veins and weathering rind

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with calcite/magnesite and accessory magnetite

Polished black-and-brown river pebble

Likely altered basalt or hornfels; exact identification requires testing

Likely serpentine-rich metamorphic rock

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and minor chlorite/talc

Polished fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Weathered iron-rich quartz or limonite-bearing stone

Quartz (SiO₂) with iron-oxide/hydroxide coatings, likely goethite–limonite

Serpentinite (likely)

Serpentinite, dominated by serpentine-group minerals (chrysotile, lizardite, or antigorite), commonly with magnetite and relict olivine/pyroxene

Greenstone / Serpentinite Pebble

Serpentinite (Hydrated Magnesium Silicate, Mg3Si2O5(OH)4)

Serpentinite (serpentine-rich rock)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chlorite, and talc

Schist

Mica schist, likely muscovite–biotite schist with quartz and feldspar

Large bivalve shell fossil (possibly a clam)

Fossilized bivalve; exact taxon cannot be determined from the image

Jasper

Silicon Dioxide (SiO2) with impurities

Quartz pebble

Silicon dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Sandstone

Clastic Sedimentary Rock