Man Made Glass (Not A Natural Rock Or Mineral)

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Smoky Quartz

Smoky Quartz (SiO2)

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Blue Slag Glass

Amorphous Silica (Industrial byproduct)

Inlaid stone ring (likely jasper or agate)

Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Red/orange coral beads (likely dyed or treated coral)

Corallium spp.; calcium carbonate, mainly calcite (CaCO₃)

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Diamond

Diamond (pure Carbon, C)

Banded Sandstone

Arenite with Liesegang banding

Blue Slag Glass

Ferro-silicate glass (Slag)

Amber jewelry (possibly amber-colored glass or resin)

Amber — fossilized plant resin, chiefly composed of polymerized terpenoids; the pictured material cannot be confirmed from the image

Blue faceted gemstone ring, likely synthetic sapphire or blue topaz

Uncertain from image; possible corundum (Al₂O₃) or topaz (Al₂SiO₄(F,OH)₂)

Slag

Ferrous Slag (Siliceous industrial waste)

Moissanite

Silicon Carbide (SiC)

Diamond

Carbon (C)

Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass

Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass

Chalk

Calcium carbonate (CaCO3)

Chalk

Calcium Carbonate (CaCO3)

Beaded gemstone jewelry (likely amethyst, lapis lazuli, and pearl or glass imitation)

Mixed mineral beads; possible quartz (SiO₂) and lazurite-bearing lapis lazuli

Diamond

Carbon (C)

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Gemstone cocktail ring, likely jade and quartz or glass beads

Possible jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); the peach-colored beads cannot be reliably identified from the image

Smoky Quartz

Silicon Dioxide (SiO2)

Clear-stone silver-tone teardrop earring

The stones may be colorless quartz or glass; the image does not allow reliable identification. Metal setting appears silver-tone.

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Pyrite Concretion (Grapestone)

Iron Sulfide (FeS2) Concretion

Diamond

Carbon (C)

Diamond (Colorless/White)

Carbon (C)

Carnelian cabochon pendant

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Goldstone

Aventurine Glass (SiO2 + Cu small inclusions)

Rounded granite cobble

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Sandstone

Sedimentary Clastic Rock

Green aventurine bead bracelet

Quartz (SiO₂), typically green quartzite/aventurine colored by fuchsite mica or other inclusions

Gemstone jewelry ensemble

Likely mixed gemstone and glass-bead jewelry; exact stones cannot be determined from the image

Polished dendritic agate cabochon (likely agate or jasper)

Microcrystalline quartz, SiO₂, commonly chalcedony with iron-oxide inclusions

Possible ironstone concretion or weathered mineral nodule

Iron-oxide-rich concretion, likely goethite/limonite; identification uncertain from the photo

Pearl

Biogenic CaCO3 (Aragonite and Calcite)

Yooperlite (Syenite clast containing fluorescent Sodalite)

Sodalite-bearing Syenite