Man Made Mineral Simulant (Glass)

Blue Goldstone

Aventurine Glass (Silicon Dioxide with metal inclusions)

Aura Quartz

Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

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

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Faceted transparent gemstone, likely glass or cubic zirconia

Uncertain from image; possible cubic zirconia (zirconium dioxide, ZrO₂) or glass imitation

Diamond (or synthetic simulant)

Cubic C (Carbon)

Tumbled sea glass or pale-green quartz pebble

Indeterminate from image; possibly quartz (SiO₂), but the smooth translucent piece may be man-made glass

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Hematite

Iron(III) oxide (Fe2O3)

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Tumbled black stone, likely black obsidian

Obsidian; volcanic glass, typically rhyolitic composition (SiO₂-rich)

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Diamond (or Diamond Simulant)

Carbon (C)

Red gemstone ring (likely synthetic ruby or red glass)

Possibly corundum (Al₂O₃), chromium-colored; identity cannot be confirmed from the image

Asphalt Chunk

Asphalt concrete

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Dyed Blue Agate (Dragon Vein Agate)

Silicon Dioxide (SiO2) with artificial cobalt/organic dyes

Diamond

Native Carbon (C)

Weathered iron-rich concretion or ironstone nodule

Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Smelter Slag

Anthropogenic Silicate Slag

Metallic sulfide mineral fragment, likely galena

Galena (lead sulfide, PbS), tentative identification

Brick fragment (Man-made material)

N/A (Fired clay)

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant

Dalmatian jasper

Porphyritic microcrystalline quartz-rich rock, commonly sold as Dalmatian jasper; spots are chiefly arfvedsonite/amphibole minerals, sometimes altered feldspar

Vesicular basalt (probable iron-rich volcanic rock)

Basalt; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Diamond

Carbon (C)

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Cultured Marble (Synthetic)

Polymer-matrix composite (typically calcium carbonate in polyester resin)

Mounted clear gemstone, likely cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂), synthetic; exact stone cannot be confirmed from the image

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)

Yellow-green faceted gemstone (possibly peridot)

Undetermined; peridot is gem-quality olivine, (Mg,Fe)₂SiO₄

Diamond (or Diamond Simulant)

Carbon (C) or Zirconium dioxide (ZrO2) for CZ

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Cut diamond tennis-chain jewelry

Diamond, crystalline carbon (C), cubic crystal system