Man Made Material (Simulated Mineral)

Tektite (Indochinite)

Tektite (Amorphous Silica Glass)

Tumbled greenstone / serpentinite (probable)

Serpentinite, chiefly Mg-rich serpentine minerals (antigorite, lizardite, chrysotile), possibly mixed with chlorite, magnetite, or carbonate

Larimar

Pectolite

Fossilized oyster shell

Bivalvia; likely an oyster (Ostreidae), partly mineralized with calcite

Carnelian cabochon

Orange-red variety of chalcedony (microcrystalline quartz), SiO₂

Chert (Black Flint)

Silicon Dioxide (SiO2)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Mother of Pearl (Nacre) / Shell Fragment

Biogenic Calcium Carbonate (Aragonite and Conchiolin)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint/Jasper)

Cryptocrystalline Quartz (SiO2)

Chert / Jasper

Silicon Dioxide (SiO₂)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Diorite

Intermediate plutonic igneous rock

Goldstone

Avventurina (Cu + SiO2 glass)

Chert (Flint)

SiO2 (Microcrystalline Quartz)

Lapis lazuli and green-blue chalcedony jewelry

Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)

Pearl

Pearl (Calcium Carbonate with organic conchiolin, CaCO3)

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Banded Sandstone

Arenite with Liesegang banding

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Turquoise bead bracelet

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; the beads may be treated or imitation material

Carved smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), smoky variety

Likely rough green-blue glassy mineral fragment

Unidentified; the image is insufficient to distinguish a natural mineral from industrial slag or glass

Chert (and Flint)

Silicon Dioxide (SiO2)

Corundum (Sapphire/Ruby in Matrix)

Corundum (Al2O3)

Amethyst and aquamarine gemstone bracelet

Amethyst: purple quartz, SiO₂; blue beads likely aquamarine/blue quartz, with possible metallic spacer beads

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Small rounded pebble (rock type indeterminate)

Unidentified fine-grained lithic pebble

Likely flint (dark chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Chert (often called Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Diamond

Carbon (C)

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Amethyst gemstone ring

Quartz, purple variety — SiO₂

Green Aura Quartz

Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)

Diamond

Carbon (C)

Petrified Wood

Silicified Wood (primarily SiO2)

Blue gemstone cross pendant

Likely faceted blue topaz (Al₂SiO₄(F,OH)₂); identification is uncertain from the image

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Quartzite

Metamorphic Quartzite (SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)