Uncertain

Dark blue-black polished crystal, likely fluorite or slag-like geological material

Tentatively fluorite (CaF₂); identification is uncertain from the image alone

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Tumbled green aventurine (likely)

Quartz, SiO₂, with green fuchsite or other mineral inclusions

Orange agate (chalcedony), possibly carnelian

Microcrystalline quartz, SiO₂; agate is banded chalcedony, while carnelian is orange chalcedony

Likely river-worn chert (flint) pebble

Microcrystalline quartz (SiO₂), commonly called chert or flint

Likely yellow calcite

Calcite (CaCO₃)

Polished yellow chalcedony (likely lemon quartz/calcite alternative)

Microcrystalline quartz, SiO₂ (chalcedony); exact identification requires testing

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Porous iron-rich rock or slag-like material

Unidentified; possibly limonite/goethite-rich ironstone

Vesicular volcanic rock (likely pumice or scoria)

Vesicular volcanic rock; exact composition cannot be determined from the photo

Mixed polished gemstone bead bracelet, likely tourmalinated quartz and rhyolite/jasper

Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) and probable feldspar-rich rhyolite/jasper

Tumbled greenstone (likely serpentine or chlorite-rich stone)

Serpentinite, approximately Mg₃Si₂O₅(OH)₄; exact identification requires testing

Weathered granite or granitic gravel

Granite; quartz–feldspar–mica aggregate

Clear quartz crystal sphere

Quartz (silicon dioxide, SiO₂)

Blue-green mineral specimen, possibly turquoise

Uncertain from the image; turquoise is hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Milky quartz

Quartz (silicon dioxide, SiO₂)

Small purple crystal, possibly amethyst

Quartz (SiO₂), tentatively amethyst

Likely banded sandstone fragment

Quartz-rich sandstone (composition cannot be confirmed from the image)

Weathered chert or siliceous limestone

Microcrystalline quartz (SiO₂), possibly with carbonate matrix

Brecciated stone, likely brecciated limestone or marble

Carbonate breccia; chiefly calcite (CaCO₃), with possible dolomite and dark matrix minerals

Small dark mineral fragment, possibly mica or a metallic sulfide

Unidentified from image; possible biotite mica or iron sulfide (pyrite-group)

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image

Unakite (likely)

Epidote–K-feldspar–quartz aggregate; commonly derived from altered granite

Likely botryoidal quartz or calcite cluster

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires hardness and acid tests

Likely calcite-rich limestone

Calcite (CaCO₃), possibly recrystallized limestone

Chert (flint)

Microcrystalline quartz (SiO₂), commonly called chert; flint is a dark variety

Possibly turquoise or chrysocolla

Indeterminate copper-bearing mineral; turquoise is CuAl₆(PO₄)₄(OH)₈·4H₂O, while chrysocolla is a variable hydrated copper silicate

Likely iron-stained calcite

Calcite (CaCO₃), possibly colored by iron-oxide impurities

Small tan weathered stone, likely limestone

Probable calcite-rich limestone (predominantly CaCO₃); identification is tentative from the image

White gypsum (selenite/alabaster variety)

Gypsum, CaSO₄·2H₂O

Quartzite cobble (probable)

Quartzite, composed predominantly of recrystallized quartz (SiO₂)

Pyrite-rich rock (likely pyrite-bearing schist)

Pyrite (FeS₂) in a foliated metamorphic matrix; exact host rock cannot be confirmed from the image

Mixed gemstone bead bracelet, likely including blue quartz and dark-colored stones

Quartz (SiO₂) beads; other bead materials cannot be identified reliably from the image

Small clear-to-milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Clear crystal-bead bracelet, possibly quartz

Unidentified transparent mineral beads; quartz (SiO₂) is one possibility

Milky quartz

Quartz (silicon dioxide, SiO₂)

Pink-and-cream mineral bead bracelet (likely rose quartz and pale quartz)

Quartz, SiO₂; rose quartz is pink quartz, though the beads may include other pale stones.

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (SiO₂)

Polished bloodstone (heliotrope)

Chalcedony, microcrystalline SiO₂, with green coloring and iron-oxide inclusions

Milky quartz with iron-stained mica

Quartz (SiO₂), likely intergrown with muscovite and minor iron oxides

Weathered gray gneiss

Quartz–feldspar–mica gneiss