Man Made Object (Metalwork)

Likely ironstone concretion or weathered iron-rich rock

Goethite/hematite-bearing limonite (FeO(OH)·nH₂O / Fe₂O₃)

Carved serpentine pendant

Serpentine-group minerals, commonly antigorite/lizardite (Mg₃Si₂O₅(OH)₄), possibly mixed with chlorite or other inclusions

Tiger’s-eye (likely a polished or carved tiger’s-eye piece)

Quartz variety with fibrous crocidolite-replacement structure; SiO₂

Tumbled dark blue-green stone, likely labradorite or indigo gabbro

Indeterminate; possible feldspar-rich labradorite (plagioclase, NaAlSi₃O₈–CaAl₂Si₂O₈)

Small rounded pebble

Unidentified lithic clast; likely fine-grained sandstone, mudstone, or basalt

Black tourmaline pendulum

Schorl, a sodium–iron tourmaline; approximate formula NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Calcite

Calcium Carbonate (CaCO3)

Likely weathered sandstone or iron-stained sedimentary pebble

Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone

Small stud earring with a purple gemstone (possibly amethyst)

Possible amethyst, a purple variety of quartz (SiO₂); identification is uncertain from the image

Likely dark rounded stone or mineral fragment

Indeterminate; possibly a water-worn mafic rock such as basalt

Unable to Identify (Image Obscured)

Pink quartz crystal, possibly rose quartz

Quartz (silicon dioxide, SiO₂), likely pink quartz/rose quartz

Likely polished blue-green stone bead or small gemstone

Uncertain from the photo; possibly dyed or treated agate/chalcedony, but identification requires testing

Fossilized ammonite

Ammonoidea (likely an ammonite; exact genus indeterminate)

Tumbled blue stone, likely blue aventurine or dyed quartzite

Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing

Heart-shaped Pebble (Limestone/Quartz)

Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)

Gemstone-set ring, likely cubic zirconia or diamond

Likely synthetic cubic zirconia (zirconium dioxide, ZrO₂); stones may alternatively be diamond (carbon, C)

Jadeite Jade

Jadeite (NaAlSi2O6)

Pearls (likely freshwater cultured pearls)

Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin

Likely polished dark stone or mineral specimen (unidentifiable from image)

Undetermined; possibly dark quartz-rich material, basalt, or obsidian

Likely polished dark stone (identity uncertain)

Undetermined; possibly polished basalt, chert, or another dark silicate rock

Small fossil shell, possibly a fossilized brachiopod or clam

Unidentified fossilized shell; exact taxon cannot be determined from the image

Possible fossil tooth or bone fragment

Indeterminate fossilized vertebrate material; species cannot be identified reliably from this image

Weathered mica-rich schist

Muscovite/biotite schist, likely quartz-bearing

Weathered quartz-rich pebble

Likely granitic or felsic igneous rock; quartz (SiO₂) with feldspar and minor mafic minerals

Polished citrine quartz point

Quartz, silicon dioxide (SiO₂), yellow-orange variety commonly sold as citrine; possibly heat-treated amethyst

Spiny Oyster Shell

Spondylus varians (Biogenic Calcium Carbonate)

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Polished operculum (“Shiva eye” shell)

Calcium-carbonate shell operculum, commonly from a turban snail (family Turbinidae); not a mineral specimen

Likely biotite-rich mica schist

Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂); exact identification from image is uncertain

Black-and-copper polished granite

Biotite granite, likely a commercial gabbro/granite variety

Honey calcite

Calcite (calcium carbonate, CaCO₃)

Gemstone bead necklace (likely citrine or yellow quartz)

Quartz, SiO₂; precise identification is uncertain because the beads are blurred and metal settings obscure them

Quartz-rich stone tool or shaped mineral specimen

Likely milky quartz or quartzite (SiO₂); exact material cannot be confirmed from the image

Diamond (or Diamond Simulant)

Carbon (C)

Probable shell fragment (fossil or modern shell)

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

Weathered limestone pebble

Limestone, chiefly calcite (CaCO₃)

Petrified Wood

Silicified wood (primarily SiO2)

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Polished rose quartz bowl

Quartz, silicon dioxide (SiO₂), likely rose quartz

Diamond-set gold ring

Diamond (crystalline carbon, C) set in a gold alloy; the metal and setting are manufactured

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)