Synthetic (Ceramic)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Cubic Zirconia

Zirconium dioxide (ZrO2)

Imitation or Cultured Pearl Earrings

Calcium carbonate (CaCO3) or synthetic polymer/glass

Silicon Carbide (Carborundum)

Moissanite (SiC)

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Hematite bead bracelet

Hematite (Fe₂O₃), likely polished or magnetically enhanced beads

Polished hematite

Hematite (Fe₂O₃), likely a tumbled iron-oxide specimen

Chrysocolla in Malachite

Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)

Hematite

Hematite (Fe₂O₃), likely a polished specular hematite palm stone

Rainbow carborundum (silicon carbide)

Silicon carbide, SiC; commonly synthetic moissanite/carborundum specimen

Zirconia (Ceramic) & Ion-X Glass

Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass

Hematite

Iron(III) oxide (Fe2O3)

White chalcedony (possibly milky quartz) cabochon

Chalcedony, microcrystalline SiO₂; appearance may also represent milky quartz or synthetic imitation

Porcelain Sherd

Ceramic artifact

Portable Ceramic Space Heater

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

Faceted Gemstone

Unknown transparent mineral, possibly Diamond (C), Cubic Zirconia (ZrO2), Quartz (SiO2), or Glass

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Glazed Ceramic Tile

Fused Silicate-Clay composite

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Terracotta (Man-made ceramic brick fragment)

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

Blue cabochon gemstone, likely synthetic spinel or glass

Undetermined; possible synthetic cobalt-blue spinel (MgAl₂O₄) or colored glass

Cubic Zirconia (as used in jewelry setting)

Zirconium dioxide (ZrO2)

Red faceted gemstone, likely synthetic ruby or red glass imitation

Possibly synthetic corundum (Al₂O₃:Cr³⁺); image alone cannot distinguish it from glass or another imitation

Faience and Carnelian in Egyptian Revival Jewelry

Faience (quartz frit) and Carnelian (chalcedony, SiO2)

Pink faceted gemstone, likely synthetic ruby or pink sapphire

Corundum (Al₂O₃), possibly chromium-colored ruby; synthetic origin likely

The user-provided image does not contain a rock or mineral specimen

Clay Concretion / Mudstone Nodule

Sedimentary Concretion (Argillaceous)

Cubic Zirconia

Zirconium dioxide (ZrO2)

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Likely pink feldspar (orthoclase or microcline)

Potassium feldspar, KAlSi₃O₈

Ruby (in costume jewelry context)

Corundum (Al2O3) with Chromium impurities

Heart-shaped ironstone pebble

Ironstone concretion, likely goethite/hematite cemented sandstone or siltstone

Galena

Lead(II) sulfide (PbS)

Iron-stained quartz-rich rock, likely granite or pegmatite fragment

Weathered granite/pegmatite; mainly quartz (SiO₂) with feldspar and iron-oxide staining

Purple cabochon gemstone, likely amethyst or purple sapphire/spinel

Indeterminate from image; possible quartz (SiO₂), corundum (Al₂O₃), or spinel (MgAl₂O₄)

Cubic Zirconia (simulant) or Diamond

ZrO2 (Cubic Zirconia) or C (Diamond)

Opalite

Synthetic glass / Opalized glass

Pyrite (Polished Palm Stone)

Iron disulfide (FeS2)

Limonite / Ironstone

Hydrated ferric oxide (FeO(OH)·nH2O)

Loose faceted colorless gemstones, likely quartz or glass-like mineral chips

Most consistent with quartz (SiO₂), though the photograph cannot exclude synthetic cubic zirconia or glass

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions