Man Made (Synthetic Rock)

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Coquina

Biogenic Limestone (CaCO3)

Iridescent polished gemstone, likely opal

Common or precious opal (hydrated amorphous silica, SiO₂·nH₂O), possibly synthetic or glass imitation

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or quartzite

Granite

Granite (Phaneritic Quartz-Feldspar intrusive rock)

Rounded pink granite cobble

Granite, chiefly quartz–alkali feldspar–plagioclase–biotite

Chert (Flint / Jasper variant)

Microcrystalline Quartz (SiO2)

Marble

Metamorphic Limestone (CaCO3)

Unakite

Altered Granite (Epidotized Granite)

Green gemstone ring, likely emerald simulant or jade

Uncertain; possible beryl (emerald, Be₃Al₂Si₆O₁₈) or jadeite (NaAlSi₂O₆), but the blurred image may show synthetic glass or another treated stone

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Pink Granite (Alkali-feldspar Granite)

Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Green faceted gemstone, likely synthetic glass or peridot

Indeterminate from image; possible peridot (olivine, (Mg,Fe)₂SiO₄) or green synthetic glass

Sandstone

Arenite (composed primarily of SiO2)

Blue Sapphire (likely costume glass imitation)

Corundum (Al2O3) with iron/titanium impurities

Faceted transparent gemstone pendant

Likely cubic zirconia (zirconium dioxide, ZrO₂); possibly diamond or synthetic moissanite

Granite

Phaneritic Felsic Igneous Rock

Granite

Granite (Felsic Plutonic Rock)

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Faceted blue gemstone, likely blue topaz or synthetic spinel

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

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Polished dark gray stone, likely basalt or fine-grained andesite

Basalt/andesite; primarily plagioclase feldspar, pyroxene, and possibly olivine or magnetite

Sandstone

Arenite (siliciclastic sedimentary rock composed mostly of quartz)

Limestone

Sedimentary Rock (Primarily CaCO3)

Ruby / Red Corundum

Al2O3 (Aluminum Oxide with Chromium trace)

Beach Pebble (Chalcedony / Chert)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline quartz (SiO2)

Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)

Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components

Sandstone

Arenite (SiO2 principal)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Amber (Simulated/Faturan Style)

Resin mix (Likely Phenolic/Celluloid if synthetic, Succinite if natural)

Riverstone (Sandstone Pebble)

Arenite (SiO2 with various lithic fragments)

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

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

Lapis Lazuli (in Matrix)

Na8[Al6Si6O24]S2 (Lazurite as the primary component)

Fine-grained gray stone, possibly slate

Slate (fine-grained metamorphosed mudstone); identification is uncertain from the image

Lapis Lazuli

Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)

Quartzite

Quartzite (Metamorphic Quartz Sandstone)