Uncertain

Blue-gray metamorphic rock fragment

Likely slate or phyllite; exact identification is uncertain from the photograph

Weathered mafic rock fragment

Likely basalt or volcanic breccia; identification is uncertain from the photograph

Rounded conglomeratic river pebble

Polymict conglomerate (lithified gravel), composition uncertain from image

Tumbled white stone, possibly quartz or marble

Uncertain; likely quartz (SiO₂) or calcite-rich marble (CaCO₃)

Small rounded mineral pebble, possibly feldspar or quartz

Uncertain from image; likely a quartz- or feldspar-rich grain

Tumbled quartz-rich stone, possibly druzy quartz or chalcedony

Quartz/chalcedony (SiO₂); exact identification is uncertain from the photograph

Small gray stone, possibly basalt or weathered chert

Uncertain; likely fine-grained basalt (mafic volcanic rock)

Quartz-rich weathered rock, possibly quartzite

Quartzite (mostly SiO₂); exact identification is uncertain from the image

Weathered quartz-rich rock, possibly quartzite or granite fragment

Quartzite (SiO₂-dominant) or altered granitoid; uncertain from image

Weathered dark outcrop

Likely basalt or andesite; exact identification is uncertain from the photograph

Weathered dark igneous rock fragment

Likely basalt or andesite; exact identification is uncertain from the photograph

Tumbled green-yellow chalcedony (likely prehnite or serpentine)

Cryptocrystalline quartz (chalcedony), SiO₂; identification is uncertain from the photograph

Tumbled white stone, possibly milky quartz

Milky quartz (quartz, SiO₂), identification uncertain from image

Iron-stained quartz-rich rock, possibly weathered schist

Uncertain; likely quartz–mica schist with limonite/goethite staining

Dyed blue-purple tumbled stone, likely quartz or calcite

Uncertain; commonly dyed quartzite/chalcedony (SiO₂) or calcite (CaCO₃)

Honey-colored quartz-rich rock, possibly yellow chalcedony or quartzite

Quartz/chalcedony, SiO₂; exact identification is uncertain from the photograph

Small brown mineral fragment, possibly quartz/chert

Uncertain; likely microcrystalline quartz (SiO₂) or a weathered silicate rock

Possible weathered basalt or slag fragment

Basalt, chiefly plagioclase and pyroxene; identification is uncertain from the image

Weathered iron-rich rock, possibly laterite or ironstone

Goethite–hematite-rich ferruginous rock; uncertain without testing

Likely weathered sandstone or iron-rich sedimentary fragment

Uncertain; probable quartz-rich sandstone with iron-oxide cement

Likely sandstone or weathered quartz-rich rock fragment

Quartz-rich sandstone; exact identification is uncertain from the photograph

Weathered gray stone, likely granite or gneiss

Probable granitic rock; exact identification is uncertain from the image

Faceted pale-green gemstone, likely prasiolite or green quartz

Quartz (SiO₂), likely prasiolite; identification is uncertain from the photograph

Weathered quartz-rich pebble

Quartz-rich sandstone or quartzite (identification uncertain from image)

Green aventurine jade-style cabochon (likely dyed chalcedony or glass imitation)

Quartz/chalcedony, SiO₂; exact material is uncertain from the image

Pale yellow tumbled stone, possibly calcite or quartz

Uncertain; likely calcite (CaCO₃) or pale chalcedony/quartz (SiO₂)

Small metallic-looking rock fragment

Uncertain; possibly galena-bearing ore or mica-rich schist

Tumbled light-green quartz, likely aventurine or prehnite

Quartz (SiO₂), possibly green aventurine; visual identification is uncertain

Weathered brown rock, likely basalt or iron-rich breccia

Probable basaltic rock; exact identification is uncertain from the photograph

Tumbled yellow chalcedony (likely honey agate or yellow jasper)

Microcrystalline quartz, SiO₂; precise identification is uncertain from the photograph

Tumbled brown stone, likely jasper or fine-grained quartzite

Uncertain; probable microcrystalline quartz (SiO₂), possibly ferruginous jasper

Polished amber-like chalcedony (likely carnelian or yellow jasper)

Microcrystalline quartz, SiO₂; exact identification is uncertain from the image

Possible basalt or industrial iron-rich slag

Basalt (plagioclase–pyroxene rock); identification uncertain from image

Likely weathered quartz-rich rock fragment

Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock

Weathered quartz-rich cobble (probable quartzite or silicified rock)

Quartzite, predominantly SiO₂; exact identification is uncertain from the photograph

Likely weathered quartz-rich rock, possibly smoky quartz or chert

Quartz (SiO₂), though exact identification is uncertain from the photograph

Fossil shark tooth

Likely Otodus megalodon (species identification uncertain from image)

Mica-rich metamorphic rock, likely schist

Quartz–mica schist; commonly quartz with muscovite and/or biotite mica

Polished orbicular jasper (likely ocean jasper)

Silicified volcanic rock; microcrystalline quartz/chalcedony (SiO₂) with iron oxides and altered volcanic minerals

Likely granite or granitic gneiss

Coarse-grained quartz–feldspar–mica rock; possibly biotite granite or banded granitic gneiss

Polished green stone, likely serpentine

Serpentinite; chiefly antigorite/lizardite, Mg₃Si₂O₅(OH)₄

Copper-bearing rock, likely oxidized native copper ore

Native copper (Cu) with copper-oxide/carbonate minerals, possibly chrysocolla, malachite, and cuprite in a limonitic host