Man Made Object (Simulant)

Unable to identify - Image contains non-geological items

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Terracotta (Man-made ceramic brick fragment)

Baked clay / High-iron ceramic (Silicate-based ceramic)

Calcite

Calcite (Calcium Carbonate, CaCO3)

Portable Ceramic Space Heater

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

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

River Pebble (likely Quartzite or Chert)

Sedimentary Clast (Silicon Dioxide dominant)

Diamond ring

Diamond (crystalline carbon, C)

Hematite / Goethite (Iron Ore)

Iron Oxide (Fe2O3 / FeO(OH))

Dyed howlite or turquoise imitation

Howlite: Ca₂B₅SiO₉(OH)₅; turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O

Painted River Rock (likely Quartzite or Granite)

Quartzite or Granitic Gneiss (painted)

Siltstone or Limestone Beach Pebble

Siltstone / Micritic Limestone

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

River Pebble (likely Quartzite or Siltstone)

Sedimentary Clast (SiO2 based)

Polished serpentine pendulum

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

Diamond (or Cubic Zirconia simulant)

Carbon (C) or Zirconium Dioxide (ZrO2)

Cubic Zirconia (Simulated Diamond)

Zirconium Dioxide (ZrO2)

Chondrite Meteorite

Stony Meteorite (Chondrite)

Pearls (likely freshwater cultured pearls)

Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (synthetic ZrO₂), possibly glass or quartz

Petrified Wood

Silicified Wood (primarily SiO2)

Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)

Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Gemstone bead necklace (likely citrine or yellow quartz)

Quartz, SiO₂; precise identification is uncertain because the beads are blurred and metal settings obscure them

Blue sapphire ring

Corundum, aluminum oxide (Al₂O₃), blue variety colored mainly by iron and titanium

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)

Ambergris

Ambrein-rich Calculus

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

Pink quartz crystal, possibly rose quartz

Quartz (silicon dioxide, SiO₂), likely pink quartz/rose quartz

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Polished citrine quartz point

Quartz, silicon dioxide (SiO₂), yellow-orange variety commonly sold as citrine; possibly heat-treated amethyst

Spiny Oyster Shell

Spondylus varians (Biogenic Calcium Carbonate)

Tumbled dark blue-green stone, likely labradorite or indigo gabbro

Indeterminate; possible feldspar-rich labradorite (plagioclase, NaAlSi₃O₈–CaAl₂Si₂O₈)

Small rounded pebble

Unidentified lithic clast; likely fine-grained sandstone, mudstone, or basalt

Calcite

Calcium Carbonate (CaCO3)

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (synthetic zirconium dioxide, ZrO₂); possibly colorless quartz or laboratory diamond

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Native Silver

Silver (elemental Ag)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Tumbled blue stone, likely blue aventurine or dyed quartzite

Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing