Undetermined

Water-worn brown pebble, likely basalt or other fine-grained volcanic rock

Undetermined mafic volcanic rock; basalt is a plausible identification

Possible iron-rich meteorite fragment

Undetermined; possibly an iron meteorite or stony-iron meteorite

Small brown rock fragment

Undetermined; possibly weathered iron-stained quartzite or chert

Dark rock/mineral fragment

Undetermined; possibly magnetite-rich basalt or iron sulfide

Small dark mineral or rock fragment

Undetermined; possibly a dark mafic mineral such as biotite or magnetite

Tumbled yellow-brown stone, likely jasper or quartzite

Undetermined; possibly microcrystalline quartz (SiO₂) in jasper or quartzite

Iron-stained weathered stone (tentative)

Undetermined; possibly weathered iron-rich basalt or concretion

Faceted blue gemstone ring, likely synthetic spinel or glass; identity uncertain

Possibly synthetic blue spinel (MgAl₂O₄) or laboratory sapphire (Al₂O₃); the clear side stones may be cubic zirconia or glass

Small dark stone (unidentified)

Undetermined; image lacks enough detail for reliable identification

Small rounded pebble (likely quartz-rich stone)

Undetermined; possibly quartzite or a quartz-rich river pebble

Rounded weathered stone (likely river cobble)

Undetermined; possibly fine-grained volcanic rock such as andesite

Small dark rock fragment (unidentified)

Undetermined; composition cannot be identified reliably from this photograph

Small weathered stone fragment

Undetermined; possibly a feldspar- or quartz-bearing rock fragment

Color-change gemstone ring (stone possibly alexandrite or a synthetic imitation)

Undetermined from the image; alexandrite is chrysoberyl, BeAl₂O₄

Likely black river pebble

Undetermined; possibly a dark mafic rock such as basalt or andesite

Dark tumbled stone, likely black river pebble

Undetermined; possibly basalt or a dark metamorphic rock such as slate

Small brown mineral or rock fragment

Undetermined; the image lacks enough detail for a reliable identification

Blue gemstone bead bracelet, likely dyed agate or another blue stone

Undetermined; possibly dyed chalcedony (microcrystalline quartz, SiO₂)

Pistachio-green and dark mineral-bearing rock, possibly serpentine with dark inclusions

Undetermined; the image is insufficient for reliable species-level identification

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Metallic meteorite fragment (probable stony-iron or iron meteorite)

Undetermined meteoritic Fe–Ni alloy with silicate minerals

Possible iron-rich stone or meteorite fragment

Undetermined; possibly magnetite-bearing rock or an ordinary chondrite

Likely metallic meteorite fragment

Undetermined; possibly an iron meteorite or stony-iron meteorite

Undetermined Due to Blur (Possible Flesh-Tone Mineral)

Unknown (Insufficient Visual Clarity)

Dark weathered igneous cobble, likely basalt

Basalt; fine-grained mafic rock composed chiefly of plagioclase and pyroxene, commonly with olivine

Dark rock fragment, possibly basalt

Undetermined; possibly basalt (fine-grained mafic volcanic rock)

Yellow faceted gemstone, likely synthetic cubic zirconia or glass; species cannot be confirmed from the image

Undetermined; possible cubic zirconia (ZrO₂), a manufactured gemstone simulant

Rounded green-gray pebble, possibly andesite or basalt

Undetermined fine-grained volcanic rock; visual identification is uncertain

Likely foliated metamorphic rock (schist or phyllite)

Undetermined from the image; possibly mica-rich schist or phyllite

Mixed rock and mineral collection; individual pieces are too small and indistinct for reliable identification

Undetermined; several specimens appear to be common silicate rocks or minerals

Possibly a metallic iron-rich meteorite

Undetermined iron meteorite; composition cannot be confirmed from the image

Small stone fragments

Undetermined; the image does not show enough detail for a reliable identification

Small rock fragment (unidentified)

Undetermined; the image does not show enough detail for reliable identification

Small rough rock fragment

Undetermined; the image does not show enough detail for a reliable identification

Small green stone, possibly serpentine or greenstone

Undetermined; serpentine minerals are generally Mg₃Si₂O₅(OH)₄

Blue cabochon, likely dyed or synthetic material

Undetermined; possibly dyed chalcedony (SiO₂), glass, or synthetic corundum

Small brown pebble, possibly jasper or iron-stained quartz

Undetermined; likely quartz (SiO₂) or iron-oxide-stained silica

Faceted clear gemstone in a gold-tone ring, likely colorless glass or cubic zirconia

Undetermined; possible cubic zirconia (ZrO₂) or glass (amorphous SiO₂)

Likely dark polished stone bead or cabochon

Undetermined; the image is too blurry to identify its composition reliably

Small reddish-brown stone, likely jasper or iron-stained quartz

Undetermined; possible microcrystalline quartz (SiO₂) with iron-oxide staining

Small brown pebble, possibly chert or jasper

Undetermined silica-rich pebble; possibly microcrystalline quartz (SiO₂)

Possible green glassy mineral pebble

Undetermined; possibly green aventurine (quartz) or another green mineral