Unknown (Likely Sedimentary Or Metamorphic)

Rounded gray-green pebble, likely fine-grained volcanic rock

Possibly andesite or basalt; exact identification requires examination

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

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

Tumbled dark green stone, likely serpentine or greenstone

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

Dark, rounded river pebble (likely basalt or andesite)

Unconfirmed fine-grained volcanic rock; basalt is a plausible identification

Probable shell fragment (fossil or modern shell)

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

Polished serpentine-rich rock (likely serpentinite)

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

Small reddish-brown pebble, likely iron-rich rock or mineral fragment

Unidentified; possibly iron-oxide–stained quartz or ironstone

Likely vesicular volcanic rock (possibly pumice or scoria)

Vesicular volcanic rock; exact identification requires a fresh, close-up sample

Serpentine (likely antigorite/lizardite)

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

Polished reddish-brown stone bead, possibly jasper

Likely iron-rich microcrystalline quartz (jasper; SiO₂), but the image is not sufficient for a confident identification

Metallic sulfide ore fragment, possibly pyrite-bearing rock

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

Tumbled green stone, likely serpentine

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

Unable to Identify (Image Obscured)

Note regarding image quality

Weathered serpentinite (likely)

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

Polished cabochon, possibly moonstone or opal

Not identifiable from the image; possible feldspar moonstone or opal (hydrated silica, SiO₂·nH₂O)

Fine-grained, banded rock (possibly gneiss)

Unidentified foliated silicate rock; composition cannot be determined from this close-up

Rounded, weathered rock (likely quartz-rich granite or gneiss)

Undetermined quartz–feldspar-rich rock; precise identification requires closer examination

Serpentine (likely serpentinite)

Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly with magnetite and minor brucite

Weathered, coarse-grained rock (possibly granite)

Granite, tentatively identified; exact rock type cannot be determined from the image

Tumbled Black Stone

Unknown, possibly Obsidian, Onyx, or Tourmaline

Pumice (likely)

Vesicular volcanic rock, typically rhyolitic to dacitic glass with minor feldspar and other minerals

Yellow cabochon, likely amber or yellow glass/resin

Unconfirmed; possibly amber (fossilized tree resin, an amorphous organic material)

Likely weathered copper-bearing rock

Indeterminate from the photo; possibly malachite-bearing rock (Cu₂CO₃(OH)₂)

Dark, weathered rock fragment (likely basalt or andesite)

Cannot be reliably identified from the photograph; possibly basaltic to andesitic volcanic rock

Polished stone-bead bracelet, likely mixed natural stones

Unidentified assemblage; beads appear to include feldspar-rich stones and possibly granite or other silicate rocks

Likely serpentinized ultramafic rock (serpentinite)

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

Fossil coral (likely a weathered colonial coral fragment)

Fossilized scleractinian coral; genus and age cannot be determined from the image

Likely rose quartz and a weathered blue-gray rock

The upper specimen resembles massive rose quartz (SiO₂); the lower specimen cannot be identified reliably from the image and may be a quartz- or feldspar-rich rock.

Rounded gray stone, likely a fine-grained volcanic rock

Possibly andesite or basalt; the image does not show enough detail for a definitive identification

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

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

Tumbled green-brown stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite

Rounded river pebbles

Unidentified mixed lithologies; the reddish pebble may be iron-stained sandstone or volcanic rock

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

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

Red coral (coral beads)

Precious coral, usually Corallium spp.; composed primarily of calcium carbonate (calcite)

Unidentified dark mineral or rock specimen

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

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

Unknown Rock Fragment

Undetermined