Synthetic (Ceramic)

Small rounded pebble, likely sandstone or weathered limestone

Indeterminate clastic carbonate/siliciclastic pebble; mineral composition appears dominated by quartz, feldspar, and/or calcite

Polished ocean jasper (orbicular jasper), probable

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

Weathered iron-rich quartzite or ironstone cobble

Quartzite, likely limonite/goethite-stained (SiO₂ with FeO(OH)·nH₂O)

Limonite (often after Hematite or Goethite)

Limonite (FeO(OH)·nH2O)

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Lapis Lazuli

Lazurite-dominant metamorphic rock, Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Small clear crystal, possibly quartz or glass-like gemstone

Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Iron meteorite (likely etched or weathered iron meteorite)

Fe–Ni alloy, predominantly kamacite and taenite; possible ataxite/hexahedrite or coarse octahedrite

Rounded white pebble, likely limestone or marble

Calcite-rich carbonate rock; possibly micritic limestone (CaCO₃) or marble

Iron-rich river pebble, possibly hematite-bearing jasper

Hematite-bearing jasper; chiefly microcrystalline quartz (SiO₂) with iron oxides, especially hematite (Fe₂O₃)

Iron-rich breccia or hematite-bearing ironstone

Hematite–goethite ironstone, possibly brecciated jasper; chiefly Fe₂O₃ and FeO(OH)

Faceted dark gemstone, likely black spinel

Spinel, MgAl₂O₄ (visual identification is uncertain; black sapphire or other dark gems can look similar)

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Likely synthetic ruby (corundum)

Corundum (Al₂O₃), probably laboratory-grown

Emerald

Beryl (Be3Al2(SiO3)6)

Red faceted gemstone, likely synthetic ruby or red spinel

Ruby: corundum (Al₂O₃); spinel: MgAl₂O₄; visual identification alone is insufficient

Green faceted gemstone, likely synthetic glass or chrome-dyed stone

Undetermined; possibilities include green tourmaline, synthetic emerald, glass, or dyed quartz

Green cut gemstone, likely synthetic emerald or glass imitation

Undetermined; natural emerald is beryl (Be₃Al₂Si₆O₁₈), while the vivid, very uniform appearance may indicate imitation material

Red gemstone ring, likely ruby or synthetic ruby

Corundum (Al₂O₃), chromium-colored; natural versus synthetic cannot be determined from the photo

Red gemstone ring, likely synthetic ruby or red glass; exact stone cannot be confirmed from the image

Ruby (corundum, Al₂O₃) if natural; the setting appears to be silver-tone metal

Faceted gemstones, likely assorted quartz or glass-like gems

Not determinable from the photograph; possible quartz (SiO₂), topaz, or synthetic cubic zirconia

Opal cabochon or opal-like decorative specimen

Hydrated amorphous silica, SiO₂·nH₂O; likely synthetic or assembled opal material

Ruby / Red Tourmaline

Corundum (Al2O3) or Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4)

Faceted purple gemstone, possibly amethyst

Likely quartz (SiO₂), variety amethyst; identification is uncertain from the image

Dyed Alum or Dyed Quartz (Ornamental Crystal)

Silicon Dioxide (SiO2) or Potassium Alum [KAl(SO4)2·12H2O]

Green gemstone ring, possibly emerald

The green stone may be emerald (beryl, Be₃Al₂Si₆O₁₈), but the photo cannot confirm its identity; the setting appears to be silver-colored metal.

Red cut gemstone, likely synthetic ruby

Corundum (Al₂O₃); possibly lab-grown ruby or red glass imitation

Tumbled quartz-rich stone, likely orange chalcedony or iron-stained quartzite

Microcrystalline quartz (SiO₂), possibly quartzite; orange coloration from iron oxides

Tumbled coral limestone

Biogenic calcarenite/coral limestone, predominantly calcium carbonate (CaCO₃; calcite/aragonite)

Weathered iron-rich sedimentary rock (probable laterite/ironstone)

Limonite/goethite-rich ferruginous material; commonly approximated as FeO(OH)·nH₂O with clay and quartz

Tumbled white quartz or quartzite pebble

Quartz (SiO₂), possibly massive quartzite

Faceted blue gemstone, likely blue topaz or synthetic spinel

Topaz (Al₂SiO₄(F,OH)₂) or synthetic spinel (MgAl₂O₄); image insufficient for certainty

Parti Sapphire

Corundum (Al2O3)

Tumbled dark stone, possibly hematite or black jasper

Uncertain; likely hematite (Fe₂O₃) or fine-grained chalcedony/jasper (SiO₂)

Polished black stone sphere (likely black basalt or black tourmaline)

Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone

Black Veined Jasper (Spiderweb Jasper)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Possible iron-rich meteorite fragment

Undetermined; possibly an iron meteorite or stony-iron meteorite

Likely tumbled white quartz or quartzite pebble

Quartz (SiO₂), possibly quartzite