Uncertain

Fossil oyster shell

Ostrea or Exogyra sp. (identification uncertain)

Small dark rock fragment

Uncertain; possibly weathered basalt or slag

Raw milky quartz (likely quartz/chalcedony fragment)

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, likely milky quartz with iron staining

Quartz (SiO₂), possibly a quartz vein fragment

Blue aventurine or dyed blue quartz

Quartz, SiO₂; likely aventurine quartz if natural blue inclusions are present

Likely quartz-rich metamorphic rock (quartzite or micaceous schist)

Quartzite/schist; predominantly quartz (SiO₂) with mica and minor iron oxides

Hematite bead bracelet

Hematite (iron(III) oxide, Fe₂O₃), likely polished magnetic hematite or hematite-coated beads

Tumbled ruby-bearing corundum

Corundum (Al₂O₃), likely ruby variety

Calcite crystal fragment

Calcite (calcium carbonate, CaCO₃)

Tumbled jasper (likely)

Microcrystalline quartz, SiO₂; likely jasper, a variety of chalcedony

Tumbled jasper or chert pebble

Microcrystalline quartz, mainly SiO₂, likely jasper/chert

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green fuchsite mica or chlorite inclusions

Diamond jewelry pendant or cluster

Diamond, crystalline carbon (C), likely mounted in metal

Polished yellow jasper or iron-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide inclusions

Polished jasper or chert

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chalcedony

Blue quartzite or blue schist (likely quartzite)

Quartz-rich metamorphic rock; predominantly SiO₂, possibly with blue amphibole or dumortierite

Likely weathered pebble or mineral fragment

Indeterminate; possibly quartz-rich stone, iron-stained feldspar, or a small chert fragment

Rounded metamorphic cobble, likely gneiss or amphibolite

Banding-free biotite–quartz–feldspar gneiss or amphibolite; exact identification requires testing

Chert or flint fragment

Microcrystalline quartz (SiO₂), likely chert

Coarse-grained granite or granitic gneiss

Granite; mainly quartz, feldspar, and mica (possibly foliated orthogneiss)

Polished yellow-brown chalcedony (likely carnelian or mossy/iron-stained agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide inclusions

Likely weathered granite or granitic gneiss

Granite; mainly quartz, feldspar, and minor mica/amphibole

Small pink quartz pebble

Quartz, SiO₂; possibly rose quartz or pale chalcedony

Fossilized bone fragment (tentative)

Petrified bone; mineral replacement commonly by microcrystalline quartz, calcite, or iron oxides

Likely weathered granite or granitic gneiss

Granite; quartz–feldspar–mica aggregate (possibly foliated gneiss)

Tumbled yellow-green stone, likely serpentine or nephrite jade

Serpentine-group mineral, commonly antigorite/lizardite; possible nephrite, a tremolite–actinolite amphibole aggregate

Tumbled blue-green stone, likely amazonite

Amazonite, a green microcline feldspar (KAlSi₃O₈)

Tumbled green stone, likely serpentine

Serpentine-group minerals, commonly antigorite or lizardite; approximate formula Mg₃Si₂O₅(OH)₄

Tumbled black stone, likely black obsidian

Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)

Green jade-like carved pendant or worry stone

Likely nephrite jade (tremolite–actinolite), but the image alone cannot confirm the material

Tumbled hawk’s eye (blue tiger’s eye)

Quartz (SiO₂) with parallel, crocidolite-derived fibrous inclusions

Milky quartz (rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Likely polished quartz-rich stone or calcite specimen

Uncertain; possibly quartz (SiO₂) or calcite (CaCO₃)

Tumbled dark stone, likely labradorite or serpentine

Likely labradorite (plagioclase feldspar; approximately NaAlSi₃O₈–CaAl₂Si₂O₈) or serpentine-group mineral

Quartz-rich rock, likely quartzite or weathered sandstone

Quartzite (mostly SiO₂); possibly quartz arenite sandstone

Weathered quartz-rich rock fragment (possibly iron-stained quartzite)

Quartzite; primarily quartz (SiO₂), with iron-oxide staining and minor accessory minerals

Likely blue sapphire ring

Corundum (Al₂O₃), likely sapphire; surrounding stones may be diamonds or colored gems

Likely gray granitic rock

Granite or granodiorite; chiefly quartz, feldspar, and mica/amphibole

Rounded quartz-rich beach pebble

Likely milky quartz or quartzite (SiO₂)

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Tumbled amber-like chalcedony or resinous fossil material

Likely chalcedony (microcrystalline SiO₂), though the appearance could also indicate copal/amber

Tumbled black stone, likely black tourmaline or obsidian

Schörl tourmaline: NaFe3Al6(BO3)3Si6O18(OH)4, or volcanic glass (obsidian: mainly SiO2)