Indeterminate

Fossil shell fragment

Indeterminate molluscan bioclast, likely aragonite or calcite

Pale green translucent mineral fragment

Indeterminate; possibly fluorite, calcite, or glassy quartz

Fossil-bearing sedimentary rock, possibly fossil wood or bone

Indeterminate silicified/carbonate fossil in sandstone or mudstone

Likely dark green-gray metamorphic pebble

Indeterminate; possibly chlorite schist, serpentinite, or amphibolite

Brown Pebble (River Rock)

Indeterminate (Likely Silicon Dioxide / Quartz-rich)

Orange chalcedony or tumbled carnelian fragment

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/carnelian

Weathered sandstone fragment

Quartz-rich clastic sandstone, possibly arkose or lithic sandstone

Rounded sandstone pebble

Quartz-rich sandstone, likely arkose or subarkose

Rounded quartz-rich pebble, likely quartzite or chert

Quartzite (mostly microcrystalline SiO₂); exact identification requires hardness and acid tests

Quartz-rich breccia or quartzite with iron-oxide veining

Microcrystalline to granular SiO₂ (quartz), with hematite/goethite and minor feldspar or mica

Banded metamorphic rock, likely gneiss or foliated amphibolite

Quartz–feldspar–mica gneiss or amphibolite; exact identification requires testing

Tumbled quartz-rich stone, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite (metamorphic rock)

Rounded green-gray river cobble

Likely altered basalt or andesite; exact identification requires a fresh surface and tests

Likely tumbled quartz or feldspar fragment

Quartz (SiO₂) or feldspar-group silicate

Weathered quartz-rich pebble, possibly metasandstone

Quartz-rich metasandstone (provisional); mainly SiO₂ with minor feldspar, mica, or iron oxides

Rounded yellow-brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely iron-stained chert/jasper

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite, predominantly crystalline SiO₂, possibly micaceous or feldspathic

Polished turquoise-colored stone, likely chrysoprase or dyed agate

Uncertain; possible chalcedony (microcrystalline SiO₂) or turquoise (hydrous copper aluminum phosphate)

Japanese garden lantern and stepping stones

Likely granite (quartz, feldspar, and mica), though exact stone cannot be confirmed from the image

Tumbled yellow quartz pebble (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow coloration likely from iron impurities or irradiation-related defects

Fossiliferous limestone, possibly an oyster or other bivalve fossil

Calcite (CaCO₃) shell material preserved in micritic limestone; exact fossil taxon cannot be confirmed from one image

Amygdaloidal basalt pebble

Vesicular basalt, locally calcite- or quartz-filled amygdales

Weathered sandstone pebble

Quartz-rich sandstone, commonly arkosic or ferruginous sandstone

Iron-rich weathered pebble

Likely limonite/goethite-bearing rock; exact identification requires testing

Pearl

Pearl; primarily aragonite (CaCO₃) with conchiolin

Fossilized bivalve shell

Bivalvia indeterminate; likely a preserved clam or cockle shell, composed mainly of calcium carbonate (CaCO₃)

Polished septarian-style jasper or rhyolite

Likely silica-rich volcanic rock, possibly rhyolite, with iron-oxide and manganese-oxide veining

Tumbled brown agate (likely moss or plume agate)

Microcrystalline quartz, chiefly chalcedony (SiO₂), with iron-oxide and possibly mineral inclusions

Green cabochon ring stone (likely dyed jade, aventurine, or glass imitation)

Undetermined; possible nephrite jade (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂), jadeite (NaAlSi₂O₆), or green aventurine quartz

Gemstone jewelry ensemble

Likely mixed gemstone and glass-bead jewelry; exact stones cannot be determined from the image

Tumbled yellow quartz, possibly citrine

Quartz (SiO₂), likely iron-colored citrine or pale golden chalcedony

Likely polished quartz or quartz-rich pebble

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Chalcedony / milky quartz flake

Microcrystalline quartz (SiO₂), likely chalcedony; possibly a worked quartzite or chert fragment

Polished red plume agate

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Coral fossil (likely fossilized colonial coral)

Calcareous fossil coral; commonly *Scleractinia* or *Tabulate/ rugose coral* (identification requires close pore-pattern examination)

Conglomerate

Polymictic conglomerate; rounded clasts cemented in a fine-grained matrix

Small rough rock fragment, likely iron-rich sedimentary rock or weathered soil-cemented material

Indeterminate from the photograph; possibly ferruginous sandstone or ironstone

Tumbled banded stone, likely sandstone or quartzite

Indeterminate; possibly quartz-rich sandstone (mostly SiO₂)

Unidentified small green-brown mineral fragment

Indeterminate from the photograph; possibly olivine, but identification is uncertain

Drill-core rock, likely foliated metamorphic rock

Indeterminate from the photograph; possibly slate, phyllite, or schist

Unidentified tan rock fragment

Indeterminate from photograph; possibly a carbonate rock such as limestone

Fossilized bone, likely a large vertebrate limb or rib fragment

Petrified bone; exact taxon indeterminate from the image