Man Made (Synthetic Rock)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Goldstone and pink quartz bead strands

Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible

Coquina (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Diorite (River Pebble)

Intermediate Phaneritic Igneous Rock

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Chert

Microcrystalline quartz (SiO2)

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Ruby (Faceted)

Corundum (Al2O3:Cr)

Ruby

Corundum (Al2O3)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Limestone

Calcareous sedimentary rock (CaCO3)

Flint

Silicon dioxide (SiO2)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

River Pebbles (Chert and Quartzite)

Sedimentary Clastic Rock (Silica-rich)

Iridescent coated quartz (likely synthetic/display gemstone)

Quartz, silicon dioxide (SiO₂), likely faceted and surface-coated; exact material cannot be confirmed visually

Red faceted gemstone jewelry setting

Likely synthetic ruby or red spinel centerpiece with colorless accent stones; exact identification requires gemological testing

Diamond (or Diamond Simulant)

Carbon (C)

Diamond in Kimberlite

Diamond (C in Kimberlite)

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Bismuth

Bismuth (Bi)

Silicon Carbide (Carborundum)

Moissanite (SiC)

Cubic Zirconia (CZ)

Zirconium dioxide (ZrO2)

Blue glass-like gemstone specimen (likely dyed or synthetic quartz)

Uncertain; possibly blue-dyed quartz or synthetic glass, not confidently identifiable from the image

Synthetic Ruby (Jewel Bearings)

Synthetic Corundum (Al2O3 doped with Chromium)

Colorless faceted gemstone, likely cubic zirconia

Synthetic cubic zirconia (zirconium dioxide, ZrO₂); identity is visual and not definitive

Blue sapphire ring

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

Granite

Phaneritic Plutonic Felsic Rock

Malaysian 50 Sen Coin

Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)

Chert (Flint)

Silicon Dioxide (SiO2)

Tektite

Impactite (Natural Silicate Glass)

Sandstone

Arenite

Basalt

Basalt (comprising Plagioclase feldspar, Pyroxene, and Olivine)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Hematite

Iron(III) oxide (Fe2O3)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Chert (Flint)

Chert (Cryptocrystalline Silica, SiO2)

Tumbled amethyst

Amethyst, purple quartz (SiO₂), colored by trace iron and irradiation