Industrial Byproduct (Anthropogenic Material)

Dyed agate (likely dyed chalcedony)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Rough aquamarine (likely beryl)

Beryl, Be₃Al₂Si₆O₁₈; blue color from iron impurities

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Small pale mineral fragment

Unidentified; possibly quartz, calcite, or feldspar

Tumbled black-and-white stone, likely dendritic agate or jasper

Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites

Tiger’s eye

Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂

Tumbled citrine or iron-stained quartz

Quartz (SiO₂), likely iron-oxide-stained or natural citrine

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Schist

Mica Schist

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Moissanite

Silicon Carbide (SiC)

Red Sandstone

Arenite (with Iron Oxide pigmentation)

Quartzite (Gold/Tan River Cobble)

Quartzite (composed primarily of crystalline SiO2)

Possible iron-rich basalt or slag-like volcanic rock

Basalt, tentatively; mineral composition likely plagioclase, pyroxene, and iron oxides

Ironstone (Limonitic/Hematitic Sandstone)

Ferruginous sandstone (predominantly Fe2O3 and FeO(OH))

Diamond (or Cubic Zirconia simulant)

Carbon (C) or Zirconium Dioxide (ZrO2)

Diamond

Carbon (C)

Chert (Chert Nodule)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Rose quartz

Quartz, SiO₂ (rose-colored variety)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Green-tumbled stone, possibly epidote-bearing rock

Undetermined green silicate; possible epidote (Ca₂Al₂Fe³⁺(SiO₄)(Si₂O₇)O(OH)) in a rock matrix

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Rounded quartz-rich pebble

Likely vein quartz or quartzite; exact identification is uncertain from the image

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Orange jasper (likely tumbled)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Red faceted gemstone, possibly ruby (identification uncertain)

Ruby, if natural: corundum (Al₂O₃) colored by chromium

Concretion-bearing sedimentary rock

Likely a carbonate-rich concretion in mudstone or siltstone; exact composition cannot be confirmed visually

Fossilized scallop shell fragment

Bivalve shell, composed primarily of calcite (CaCO₃)

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Chalcedony nodule (possibly agate)

Microcrystalline quartz, SiO₂; potentially banded agate

Amazonite pendant

Amazonite, a green variety of microcline feldspar (KAlSi₃O₈)

Polished hematite bead (probable)

Hematite, Fe₂O₃

Serpentine-rich serpentinite

Serpentinite, chiefly lizardite–chrysotile–antigorite Mg₃Si₂O₅(OH)₄, possibly with calcite and talc

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant

Likely basalt pebble

Basalt, a fine-grained mafic volcanic rock; commonly composed of plagioclase, pyroxene, and sometimes olivine

Rounded pebble, likely quartz-rich river or beach pebble

Unidentified lithic clast; possibly quartzite or iron-stained quartz-rich rock

Possible iron-rich basalt or industrial slag

Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image

Small brown rock fragment; exact identification uncertain

Unidentified fine-grained lithic fragment

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Peridotite (Olivine Rock)

Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)