Man Made Object (Metalwork)

Siltstone or Limestone Beach Pebble

Siltstone / Micritic Limestone

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Polished brecciated jasper pendant

Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Beaded gemstone jewelry, likely carnelian and green aventurine

Carnelian: orange chalcedony (microcrystalline SiO₂); green aventurine: quartz with fuchsite or other inclusions (SiO₂)

Carnelian cabochon pendant

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Blue gemstone bead bracelet, likely lapis lazuli or dyed stone

Uncertain from image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or dyed quartz/glass imitation

Amethyst gemstone ring

Quartz, purple variety — SiO₂

Tumbled orange chalcedony / jasper

Microcrystalline quartz, SiO₂, likely iron-stained chalcedony or quartz-rich jasper

Lapis lazuli bead bracelet

Lapis lazuli, chiefly lazurite (Na₃Ca(Si₃Al₃)O₁₂S); commonly with calcite and pyrite

Native Silver

Silver (elemental Ag)

Amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Calcite

Calcite (Calcium Carbonate, CaCO3)

Portable Ceramic Space Heater

Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements

River Pebble (likely Quartzite or Siltstone)

Sedimentary Clast (SiO2 based)

Likely dark mineral or rock fragment

Indeterminate from image; possibly a dark silicate mineral such as hornblende, biotite, or basalt

Likely weathered pebble or mineral fragment

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

Garnet

Group of silicate minerals (e.g., Almandine: Fe3Al2(SiO4)3)

Chondrite Meteorite

Stony Meteorite (Chondrite)

Raw quartz crystal pendant

Quartz (silicon dioxide, SiO₂), likely milky or cloudy quartz

Possible dark cobble or pebble

Unidentified rock; composition cannot be determined from the image

Black tourmaline bead bracelet (likely schorl)

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Weathered pegmatite or feldspar-rich granite fragment

Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite

Petrified Wood

Silicified Wood (primarily SiO2)

Mixed gemstone bead bracelet

Likely rose quartz, amethyst, and possibly rhodonite or lepidolite beads

Diamond (in a gold ring)

Diamond (pure carbon, C)

Unidentified small tan stone

Likely quartz-rich pebble; exact identification is impossible from the image alone

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image

Black onyx or black agate bead bracelet

Microcrystalline quartz, chiefly chalcedony (SiO₂); commonly sold as black onyx, sometimes dyed black agate

Banded agate cabochon

Microcrystalline quartz (chalcedony), SiO₂

Tumbled tektite (likely Indonesian or Philippine tektite)

Natural silica-rich impact glass; chiefly SiO₂ with minor Al₂O₃, FeO, MgO, CaO, and Na₂O

Ammonite fossil

Ammonoidea; likely a Jurassic or Cretaceous ammonite

Polished serpentine pendulum

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

Polished black-and-white banded agate (likely dyed or painted)

Chalcedony (microcrystalline quartz), SiO₂; exact banding variety uncertain

Faceted glass-like gemstone (likely synthetic quartz or cubic zirconia)

Identification uncertain; possibilities include synthetic quartz (SiO₂) or cubic zirconia (ZrO₂)

Diamond

Carbon (C)

Sandstone or Quartzite Pebble

Arenite or Quartzite

Ambergris

Ambrein-rich Calculus