Not A Rock (Man Made Industrial Metal)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Weathered copper-bearing rock (likely malachite-stained basalt or greenstone)

Malachite, Cu₂CO₃(OH)₂, as a secondary coating on a mafic host rock; exact identification requires testing

Cherry Quartz

SiO2 (Silicon Dioxide with iron-rich inclusions/dye)

Likely clear quartz pebble or glassy quartz fragment

Quartz (silicon dioxide, SiO₂)

Aventurine Quartz

Silicon Dioxide (SiO2) with Fuchsite inclusions

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Industrial slag (iron/copper smelting slag)

Multiphase vitreous metallurgical slag; commonly iron-silicate glass with metal-oxide and metallic inclusions

Possible iron-rich meteorite fragment

Undetermined; possibly an iron meteorite or stony-iron meteorite

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

Slag

Anthropogenic Vitrophyre (Iron or Smelting Slag)

Likely rough metallic meteorite fragment

Unclassified iron or stony-iron meteorite; identification is uncertain from the image alone

Sea Glass

Man-made vitreous material (silica-based glass)

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Goldstone

Aventurine Glass (Man-made glass with copper inclusions)

Bismuth

Bismuth (Bi)

Quartz Vein in Host Rock

Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)

Green Agate

Silicon dioxide (SiO₂)

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Iron-stained quartz-bearing rock

Quartz (SiO₂), likely in a limonite/goethite-rich matrix

Rough Sapphire (Corundum)

Corundum (Al2O3)

Opalite

Synthetic Opalised Glass

Small metallic meteorite-like specimen

Unclassified iron-rich meteorite candidate; possibly an ordinary chondrite or terrestrial slag

Sandstone

Arenite (SiO2 based clastic rock)

Vesicular basalt (scoria-like volcanic rock)

Vesicular basalt; chiefly plagioclase, pyroxene, and olivine with gas cavities

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Quartzite

Quartzite (primarily SiO2)

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Serpentinite

Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4

Possible iron meteorite

Fe–Ni iron meteorite, possibly an ordinary chondrite or weathered iron-rich specimen

Likely metallic meteorite fragment

Undetermined iron or stony-iron meteorite; mineralogy requires testing

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) vein cutting through host rock

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Likely iron meteorite

Iron–nickel meteorite, commonly octahedrite (kamacite–taenite)

Carnelian cabochon

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

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Iron-stained Quartz (Gossan/Limonite-coated Quartz)

Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)

Basalt

Basalt

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Mystic Topaz

Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating

Possible basalt or iron-rich slag

Basalt (tentative; identification uncertain from image)

Tumbled opalite (likely man-made glass)

Opalite glass; a synthetic opalescent glass, not a natural mineral species