Man Made Alloy (Metallic)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Native Copper

Native Copper (Cu)

Copper-bearing rock, likely native copper in a matrix

Native copper (Cu), possibly with cuprite/malachite in a basaltic or porphyritic matrix

Molybdenite in Quartz

Molybdenite (MoS2) with Quartz (SiO2)

Native Copper (in coinage alloy)

Copper (Cu)

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Concrete with Aggregate

Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Iron Meteorite

Siderite (Fe-Ni alloy, primarily Kamacite and Taenite)

Cubic Zirconia (Simulated Diamond)

Cubic Zirconia (ZrO2)

Opalite

Synthetic Opalized Glass

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Blue-dyed tumbled quartz or glass imitation

Quartz (SiO₂), appearance possibly enhanced with blue dye; identity uncertain from image

Iron Meteorite (Candidate)

Iron Meteorite (Siderite)

Sea Glass

Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature

Black glassy fragment, likely obsidian or industrial glass

Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Milky quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Quartz crystal (likely clear quartz)

Quartz, silicon dioxide (SiO₂)

Polished gemstone tower assortment

Primarily quartz varieties and simulants; apparent amethyst (SiO₂), rose quartz (SiO₂), clear quartz (SiO₂), fluorite (CaF₂), sodalite, malachite, and possibly dyed or composite stones

Polished black stone, likely black obsidian

Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Pink Tumbled Quartz (Dyed)

Silicon Dioxide (SiO2)

Dyed Crackle Quartz (Green)

Quenching-treated Quartz (Silicon Dioxide, SiO2)

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite

Chert Concretion (with typical hematite/limonite staining)

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

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Silver (Native Element / Alloy)

Silver (Ag)

Tumbled gray stone, likely quartz-rich pebble

Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite

Iron Meteorite (Campo del Cielo)

Iron Meteorite, Group IAB (FeNi Alloy: Kamacite and Taenite)

Silver (Native or Alloyed)

Ag (Argentum)

Metallic iron meteorite (probable)

Iron meteorite, typically kamacite–taenite (Fe–Ni alloy)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Black Obsidian

Amorphous volcanic glass (SiO2 + impurities)

Likely iron meteorite fragment

Iron–nickel alloy, chiefly kamacite and taenite (Fe-Ni)

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2)

Iron Meteorite

Siderite (comprised primarily of Kamacite and Taenite alloys)

Likely iron meteorite fragment

Fe–Ni metallic meteorite, possibly an octahedrite (kamacite–taenite alloy)

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)