Unknown

Tumbled Black Stone

Unknown (possibly basalt, obsidian, or black jasper)

Sandstone or Quartzite with algae

Unknown specific, largely SiO2 with biological growth

Quartz-veined metamorphic rock

Likely quartz-veined schist or gneiss; exact identification requires closer examination

Tumbled amethyst

Quartz, SiO₂; purple coloration from trace iron and irradiation

Fossiliferous limestone pebble

Bioclastic limestone, composed mainly of calcite (CaCO₃); the visible holes may be fossil molds or natural cavities

Galena (likely)

Galena, lead sulfide (PbS)

Chert (likely a small flake)

Microcrystalline quartz (SiO₂); the flake-like shape alone does not establish whether it is naturally fractured or worked

Serpentine (likely serpentinized ultramafic rock)

Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄, often with magnetite and relict olivine/pyroxene

Clear quartz crystal

Quartz (SiO₂), likely a small hexagonal prismatic crystal

Weathered granite fragment

Granite, a coarse-grained plutonic rock composed mainly of quartz, feldspar, and mica

Sulfur (native sulfur)

Native sulfur, S₈

Polished Stone Pendant (Identity Unclear)

Unknown (Possibly Jasper/Agate/Quartz mixture)

Brecciated serpentinite

Serpentinite breccia, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, chrysotile) with pale carbonate or quartz-rich veins

Rough beryl, possibly emerald

Beryl, Be₃Al₂Si₆O₁₈; green color may be due to chromium or vanadium

Weathered pink-and-white quartz-rich pebble

Likely quartz–feldspar-rich granite or pegmatite; exact identification is uncertain from the photograph

Unknown metallic sulfide-bearing rock, possibly chalcopyrite or bornite

Tentative: chalcopyrite (CuFeS₂) or bornite (Cu₅FeS₄)

Serpentinite (serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with possible magnetite, olivine, pyroxene, and talc

Veined dark metamorphic rock, likely serpentinite

Serpentinite, predominantly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible quartz, calcite, and magnetite veins

Polished greenstone pebble

Greenstone (chlorite–epidote–actinolite-rich metamorphosed mafic rock)

Likely malachite-bearing copper ore

Possibly malachite (Cu₂CO₃(OH)₂) with dark copper-bearing host rock; identification is uncertain from the image

Probable shell fragment (fossil or modern shell)

Calcium-carbonate shell, likely aragonite or calcite; exact organism cannot be determined from the image

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Possible iron meteorite

Iron meteorite, likely kamacite–taenite alloy

Milky quartz

Quartz (SiO₂)

Blue aquamarine bead bracelet (possibly pale blue chalcedony or glass imitation)

Aquamarine, a blue variety of beryl (Be₃Al₂Si₆O₁₈); identification from the image is uncertain

Pegmatite with quartz, feldspar, and mica

Granitic pegmatite, chiefly quartz (SiO₂), feldspars, and mica

Quartz vein in host rock

Quartz (SiO₂) in an undetermined mineralized host rock

Likely tumbled or polished fossil shell

Fossilized mollusk shell; exact species cannot be determined from this image

Likely metallic meteorite fragment

Undetermined iron or stony-iron meteorite; mineralogy requires testing

Likely weathered river pebble

Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert

Serpentinite (likely)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, commonly with magnetite and minor carbonates

Weathered tan mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar-rich rock, or limonite-bearing material

Conglomerate

Polymictic, matrix-supported conglomerate

Weathered quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Tumbled banded agate

Chalcedony, a microcrystalline variety of quartz (SiO₂)

Weathered granite (probable)

Granite, chiefly quartz, feldspar, and dark mica or amphibole

Quartz with iron-oxide staining

Quartz (SiO₂), likely with limonite/goethite staining and possible mica or other dark inclusions

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Weathered banded gneiss

Foliated quartz–feldspar-rich gneiss; exact mineral identification requires closer examination

Weathered, garnet-bearing schist (tentative identification)

Mica schist, likely quartz–feldspar–mica schist; exact minerals cannot be confirmed from the photograph

Likely iron sulfide specimen (pyrite or marcasite)

Pyrite, FeS₂; possibly marcasite, also FeS₂

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)