Mineral (Man Made Glass)

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)

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)

Dalmatian jasper

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

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

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)

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Porcelain Tile (Sandstone-look)

Man-made Ceramic (resembling Quartz-rich Sandstone)

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Man-made Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating/dye

Goldstone (Brown)

Aventurine glass

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Polished blue calcite sphere (tentative identification)

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

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Vesicular basalt (weathered scoria)

Scoriaceous basalt; chiefly plagioclase, clinopyroxene, olivine, and iron-titanium oxides

Rounded graywacke or sandstone cobble

Lithified clastic sandstone; likely quartz–feldspar–lithic grain aggregate in a silica or calcite matrix

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Green Agate

Silicon dioxide (SiO₂)

Hematite Beads

Hematite (Fe2O3)

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates