Unknown (Likely Sedimentary Or Metamorphic)

Likely serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, brucite, and pyroxene

Chalk or soft limestone fragment

Calcite-rich limestone; primarily calcium carbonate (CaCO₃)

Greenstone / serpentine-rich metamorphic rock

Likely serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and chlorite

Tumbled green-and-white stone, likely serpentine

Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc

Polished greenstone (likely serpentinite or green granite)

Probably serpentinized ultramafic rock, chiefly serpentine-group minerals; exact identification requires testing

Tumbled dark green stone, likely serpentinite or greenstone

Serpentinite (antigorite/lizardite-rich), or chlorite–amphibole greenstone

Weathered greenstone (likely serpentinite or chlorite-rich metamorphic rock)

Serpentinite/chlorite schist; commonly dominated by serpentine-group minerals, Mg-rich chlorite, talc, and magnetite

Serpentinite (likely antigorite-rich)

Serpentinite; chiefly serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄, with magnetite, carbonate, and possible chlorite/talc

Serpentinite (likely antigorite-rich)

Serpentinite; hydrated Mg-rich silicate minerals, chiefly antigorite (Mg3Si2O5(OH)4), with possible chrysotile/lizardite and magnetite

Metallic sulfide ore fragment, possibly pyrite-bearing rock

Indeterminate; likely pyrite (FeS₂) in a sulfide-rich matrix

Unknown Rock Fragment

Undetermined

Unidentified dark mineral or rock specimen

Indeterminate from the severely blurred image; possible dark igneous rock or opaque mineral

Tumbled dark green stone, likely serpentine or greenstone

Serpentinite (hydrated magnesium silicate minerals, chiefly antigorite/lizardite); possible chlorite-rich greenstone

Small reddish-brown mineral fragment, likely quartz-bearing rock

Indeterminate; possibly iron-stained quartz or feldspar-rich stone

Tumbled green stone, likely serpentine

Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄

Likely serpentine-rich greenstone

Serpentinite/serpentinized ultramafic rock; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with chlorite, talc, magnetite, or epidote

Likely serpentinite (serpentine-rich metamorphic rock)

Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite), commonly with magnetite and minor talc/carbonate

Serpentine-rich metamorphic rock

Serpentinite, likely with magnetite and weathered ultramafic minerals

Polished serpentine-rich rock (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chlorite, and carbonate

Tumbled gray stone, likely gray agate or jasper

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

Serpentine (likely antigorite/lizardite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄

Likely serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite

Weathered serpentinite (likely)

Serpentinite; predominantly serpentine-group minerals, commonly lizardite, antigorite, and chrysotile, with possible magnetite and talc

Small gray stone, possibly granite or quartz-rich pebble

Indeterminate; likely a weathered quartz–feldspar rock fragment

Serpentine-bearing metamorphic rock (likely chromite/vesuvianite-bearing serpentinite)

Serpentinite, chiefly serpentine-group minerals [(Mg,Fe)₃Si₂O₅(OH)₄], with dark accessory minerals

Halite (Rock Salt)

Halite (NaCl)

Halite

Halite (NaCl)

Likely raw metallic mineral specimen

Unidentified; possibly galena-bearing ore or magnetite-rich rock

Himalayan Pink Salt (Halite)

Halite (Sodium Chloride, NaCl)

Weathered fossil fragment, possibly bone

Indeterminate fossilized bone; likely mineralized vertebrate bone (apatite-rich)

Likely metallic meteorite fragment

Undetermined iron or stony-iron meteorite; mineralogy requires testing

Unknown metallic sulfide-bearing rock, possibly chalcopyrite or bornite

Tentative: chalcopyrite (CuFeS₂) or bornite (Cu₅FeS₄)

Serpentine-rich rock, possibly chrysotile serpentine

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, brucite, or talc

Rounded yellow-green pebble, likely serpentine or quartzite

Provisional: serpentinite/serpentine-rich rock; alternatively iron-stained quartzite

Tumbled amethyst (tentative)

Amethyst, purple variety of quartz (SiO₂)

Likely weathered chert or flint nodule

Microcrystalline quartz (SiO₂), possibly chalcedony-rich chert

Weathered tan mineral/rock fragment

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

Greenstone / serpentinized rock

Serpentinite, commonly dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

Rock Salt (Halite)

Halite (Sodium Chloride, NaCl)

Possible iron meteorite

Iron meteorite, likely kamacite–taenite alloy

Unidentified pale pink rough mineral specimen

Possibly rose quartz or feldspar; identification is uncertain from the photograph

Likely serpentine (serpentinite) pebbles

Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly Mg₃Si₂O₅(OH)₄, sometimes containing magnetite, chromite, and minor carbonate minerals