Uncertain

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)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Weathered quartz-rich rock, possibly chert or milky quartz

Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph

Likely basalt with a pale mineral-filled vesicle

Vesicular basalt, probably containing calcite or zeolite (uncertain from image)

Rounded gray metamorphic rock, likely quartzite or gneiss

Quartz-rich metamorphic rock; exact identification is uncertain from the photograph

Tumbled blue chalcedony or pale aquamarine-like quartz

Chalcedony (microcrystalline SiO₂), possibly blue quartz; visual identification is uncertain

Weathered granite-like rock

Granite, likely biotite-bearing; exact identification is uncertain from the image

Likely metallic sulfide mineral fragment

Possibly galena (PbS) or pyrite (FeS₂); identification is uncertain from the photograph

Small tumbled dark stone, possibly basalt or slag

Likely fine-grained basalt; exact identification is uncertain from the photograph

Iron-stained milky quartz

Quartz (SiO₂), mainly massive or vein quartz, with reddish-brown iron-oxide staining and possible minor feldspar or other vein minerals

Unidentified coarse-grained rock fragments

Likely granite or granitic rock; exact identification is uncertain from the photograph

Likely basalt or vesicular volcanic rock

Basalt, possibly scoriaceous basalt; exact identification is uncertain from the photograph

Likely tumbled dark volcanic rock

Probably basalt or basaltic andesite; exact identification is uncertain from the image

Weathered sandstone or iron-stained sedimentary rock

Likely quartz-rich sandstone; exact identification is uncertain from the photograph

Quartz cluster, possibly druzy quartz on matrix

Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain

Likely weathered gray-green stone, possibly serpentinite

Serpentinite (predominantly serpentine-group minerals; identification uncertain from image)

Weathered granite or granitic rock fragment

Granite; chiefly quartz, feldspar, and mica (composition uncertain from image)

Polished banded agate slab or agate-look decorative stone

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

Weathered quartz-rich rock, possibly pegmatite or quartzite

Quartz (SiO₂)-rich aggregate; exact identification is uncertain from the photograph

Quartz-rich sandstone or granitic fragment

Likely quartz–feldspar sandstone; exact identification is uncertain from the photograph

Possible weathered granite or gneiss

Feldspar–quartz–mica rock; exact identification is uncertain from the photograph

Likely foliated metamorphic rock, possibly schist

Mica schist or micaceous quartzite; exact identification is uncertain from the photograph

Likely metallic mineral specimen

Probably galena (lead sulfide, PbS), though visual identification is uncertain

Polished dark pebble, possibly basalt or chert

Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline silica (chert)

Weathered iron-rich rock, possibly basalt or ironstone

Uncertain; likely weathered basalt (plagioclase–pyroxene) or hematite/goethite-bearing ironstone

Weathered quartz-rich pebble (probable quartzite or quartz vein fragment)

Quartzite, predominantly silicon dioxide (SiO₂); exact identification is uncertain from the photograph

Polished pink feldspar pebble

Orthoclase or microcline feldspar, KAlSi₃O₈; exact identification is uncertain from the image

Green-and-white quartz-rich rock, likely chrysoprase or serpentine-bearing stone

Uncertain; possible chrysoprase (microcrystalline quartz, SiO₂) or serpentinite (magnesium silicate minerals)

Likely weathered sandstone or iron-stained quartzite fragment

Quartz-rich sandstone (predominantly SiO₂; exact identification uncertain from image)

Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)

Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica (exact identification uncertain from the photo)

Weathered granitoid (likely granite or granitic gneiss)

Granite; chiefly quartz, feldspar, and mica (exact identification uncertain from the photo)

Rounded pale quartz-rich pebble

Likely milky quartz or quartzite (SiO₂); exact identification is uncertain from the photograph

Quartz-rich pebble, possibly chert or silicified limestone

Microcrystalline quartz (SiO₂), possibly chalcedony; exact identification is uncertain from the photograph

Polished orange agate/jasper cabochon

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration; exact variety uncertain

Possible weathered mica-rich metamorphic fragment

Mica schist or phyllite (quartz–mica assemblage; identification uncertain from image)

Weathered metallic sulfide-bearing rock, possibly chalcopyrite ore

Likely chalcopyrite (CuFeS₂) in a weathered host rock; identification is uncertain from the photograph

Tumbled chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert; exact variety uncertain from the image

Tumbled gray stone, likely serpentinite or weathered basalt

Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph