Unknown (Likely Sedimentary Or Metamorphic)

Halite (Rock Salt)

Sodium Chloride (NaCl)

Small brown mineral/rock fragment

Indeterminate; possibly weathered quartz-rich rock, ironstone, or a sulfide mineral

Jasper

Silicon dioxide (SiO2)

Possible flint (dark chert) nodule

Microcrystalline quartz (SiO₂), commonly called chert or flint

Gravel / Small Pebble

Rock Fragment (Gravel)

Banded gneiss

Gneiss, likely quartz–feldspar–mica gneiss

Polished fossil coral

Fossilized coral, commonly agatized coral (silica replacing CaCO₃)

Rough beryl, possibly emerald

Beryl, Be₃Al₂Si₆O₁₈; green color may be due to chromium or vanadium

Rounded river pebble, likely basaltic rock

Fine-grained mafic igneous rock, probably basalt or andesite; exact identification requires testing

Polished agate geode slice

Agate, a banded variety of microcrystalline quartz (SiO₂); likely quartz/chalcedony lining a geode

Tumbled serpentine

Serpentine-group minerals, chiefly antigorite and lizardite; commonly Mg₃Si₂O₅(OH)₄

Rock salt (Halite)

Halite (Sodium Chloride, NaCl)

Backlit translucent mineral specimen, possibly amber or orange calcite

Undetermined; visual appearance alone cannot distinguish amber from calcite or other translucent minerals

Green serpentine-rich stone

Serpentine-group minerals, chiefly antigorite/lizardite; possibly nephrite or chlorite-bearing rock

Likely rough rose quartz

Quartz, SiO₂ (trigonal crystal structure)

Green tumbled stone, possibly serpentine

Undetermined; appearance is consistent with serpentine-rich rock (serpentinite), but the image alone cannot confirm identification.

Dark polished stone, possibly a pebble

Undetermined; image lacks detail for reliable identification

Gem-set gold ring

Unidentified transparent gemstone, possibly quartz or glass, set in a gold-colored metal ring

Blue-green tumbled mineral specimen

Indeterminate; possibly chrysocolla, turquoise, or azurite–malachite material

Fine-grained sandstone (tentative)

Quartz-rich sandstone; exact composition cannot be confirmed from the photograph

Red jasper (likely) bead bracelet

Jasper, an opaque variety of microcrystalline quartz; SiO₂

Likely industrial slag or weathered basalt

Basaltic rock; possibly iron-rich furnace slag (diagnosis uncertain from image)

Tumbled Black Stone

Unknown (possibly basalt, obsidian, or black jasper)

Pink Halite (Himalayan Salt)

Halite (Sodium Chloride, NaCl)

Reddish-brown rock fragment, possibly iron-stained sandstone

Unidentified iron-oxide-stained rock; sandstone is a tentative visual identification

Porphyritic volcanic rock (likely andesite porphyry)

Porphyritic andesite; composition cannot be confirmed from the photograph

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

Green-brown metamorphic rock, possibly serpentinite

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

Pink halite (rock salt)

Halite, NaCl

Small blue-gray mineral fragment (undetermined)

Unidentified from the image; no reliable mineral identification is possible from color and appearance alone.

Small gray rock fragment

Unidentified rock; the image lacks enough detail for reliable mineral identification

Iron-rich jasper or brecciated chert

Microcrystalline quartz (SiO₂) with hematite/goethite inclusions

Serpentine (polished serpentinite)

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

Small pale rock fragment

Unidentified, likely a weathered granitoid or quartz-rich stone; image detail is insufficient for a precise identification

Unknown dark mineral fragment

Indeterminate; possibly a dark silicate mineral or slag-like geological fragment

Iron-stained quartzite cobble (possibly hematitic quartzite)

Quartzite, composed chiefly of quartz (SiO₂), with iron oxides such as hematite (Fe₂O₃) staining or cementing it

Likely iron meteorite fragment

Unclassified Fe–Ni meteorite; possible stony-iron fragment

Polished yellow-green serpentine pendant

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

Green copper-bearing mineral specimen, possibly chrysocolla or malachite

Tentatively chrysocolla, hydrated copper aluminosilicate; may include malachite, Cu₂CO₃(OH)₂

Small brown stone (indeterminate)

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

Small brown mineral/rock fragment (unidentified)

Undetermined from the image; no reliable species identification is possible from appearance alone.

Pink halite (rock salt)

Halite (NaCl)