Uncertain

Likely tumbled or water-worn quartz pebble

Quartz, SiO₂ (identification from the image is uncertain)

Likely small white quartz pebble

Quartz (SiO₂), identification uncertain from the image

Likely dyed pink quartz or agate fragment

Quartz, SiO₂ (identity uncertain from the image)

Likely rough quartz pieces

Quartz, SiO₂ (identification uncertain from the image)

Weathered volcanic rock, likely andesite

Andesite (tentative; hand-sample identification is uncertain)

Faceted brown gemstone ring, likely smoky quartz

Quartz (SiO₂); identification from the image is uncertain

Tumbled chalcedony (likely yellow/brown jasper or agate)

Microcrystalline quartz, SiO₂ (chalcedony; variety uncertain)

Possible basalt or iron-rich slag

Basalt (tentative; identification uncertain from image)

Dark rounded stone, likely basalt or weathered mafic rock

Basalt (probable; identification uncertain from photograph)

Tumbled yellow quartz (likely citrine or yellow chalcedony)

Quartz, SiO₂; variety uncertain from image

Likely weathered iron-rich stone

Uncertain; possibly limonite/goethite-bearing rock

Fossiliferous limestone, possibly containing a brachiopod or bivalve fossil

Calcite-rich limestone (CaCO₃), with an apparent shell impression or shell fragment

Orange chromium diopside (likely tumbled)

Diopside, CaMgSi₂O₆; orange color may reflect iron-rich composition or surface treatment/inclusion

Tumbled blue-green stone, likely turquoise or chrysocolla

Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; chrysocolla: hydrated copper aluminosilicate

Serpentine (likely antigorite-rich serpentinite fragment)

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄

Iron meteorite candidate

Fe–Ni metallic meteorite, possibly an ordinary octahedrite

Polished amethyst-bearing quartz

Quartz, SiO₂; purple coloration from irradiation and trace iron

Quartz-rich vein rock, likely milky quartz in weathered host rock

Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining

Likely weathered sandstone or iron-rich chert fragment

Indeterminate; probable quartz-rich sandstone (SiO₂) with iron-oxide cement, possibly chert

Iron-rich chert or jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides

Turquoise (small rough fragment)

Turquoise, hydrous copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Polished green stone, likely nephrite jade

Nephrite, an interlocking tremolite–actinolite amphibole aggregate (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)

Uncertain gray-and-white rock fragment

Likely quartz-bearing granite or quartzite; exact identification requires testing

Iron-rich quartz or jasper, uncertain identification

Likely quartz (SiO₂) with iron-oxide staining; exact mineral cannot be determined from the photo

Uncertain green-blue mineral specimens

Possibly chrysocolla or turquoise; exact identification requires testing

Uncertain gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica rock; exact identification requires close examination

Uncertain green-brown mineral fragment

Possibly epidote, chlorite, or altered amphibole; exact identification requires testing

Polished agate-like stone (uncertain; possibly a fossil or shell fragment)

Likely microcrystalline quartz (chalcedony), SiO₂; exact identification is limited by the image

Uncertain dark-and-white rock fragment

Likely a mixed lithic specimen, possibly quartz-bearing granite or ore; exact identification is not possible from the photograph

Uncertain dark metamorphic rock, likely schist or slate

Foliated silicate rock; possibly chlorite–mica schist or slate

Uncertain dark metallic mineral specimen

Possibly galena (lead sulfide, PbS), though the image is too blurred for reliable identification

Uncertain blue-white mineral fragment

Possibly calcite or quartz; identification is limited because the specimen is tiny and partly translucent

Uncertain small pale mineral fragment

Indeterminate; possibly calcite or a light-colored feldspar fragment

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz (SiO₂), commonly called orbicular jasper or ocean jasper

Rounded gray pebble, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase ± pyroxene/olivine)

Uncertain dark gray-brown rock fragment

Indeterminate; possibly weathered chert, serpentine, or iron-stained quartzite

Fossiliferous limestone pebble

Bioclastic limestone, chiefly calcite (CaCO₃)

Nickel–iron meteorite (likely weathered iron meteorite)

Fe–Ni alloy, chiefly kamacite and taenite

Tumbled amber-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange-red variety commonly termed carnelian

Druzy quartz cluster on matrix

Quartz (SiO₂), likely a drusy coating on a carbonate or other rock matrix

Porphyritic basalt (likely porphyritic andesite)

Plagioclase-phyric volcanic rock; plagioclase phenocrysts in a dark, fine-grained groundmass

Quartzite pebble with iron staining

Quartzite, composed mainly of recrystallized quartz (SiO₂)