Anthropogenic (Man Made Material Processed By Nature)

Red Coral (Dyed or Reconstituted)

Corallium rubrum (if natural) or Calcite/Aragonite with dye

Cupronickel (on a 1981 Mexico 20 Pesos coin)

Copper-Nickel Alloy (Cu75Ni25)

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Leland Blue Stone

Anthropogenic Iron Smelting Slag

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Vesicular basalt (probable iron-rich volcanic rock)

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

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

White quartz pebble

Quartz (SiO₂), likely milky quartz

Road-surface aggregate (crushed stone)

Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Beaded mineral/crystal jewelry (likely turquoise and coral accents)

Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials

Aventurine Quartz

Silicon Dioxide (SiO2) with Fuchsite inclusions

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Opalite

Synthetic Opalised Glass

Tumbled quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz

Dalmatian jasper

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

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Man-made earbud charging case (Not a rock or mineral)

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Jasper with Iron Staining

Silicon Dioxide (SiO2) with impurities

Polished labradorite pendant

Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Opalite (Man-made Glass)

Synthetic Opalised Glass

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Nutting Stone / Cupstone (Sandstone or Quartzite)

Sedimentary rock with anthropogenic modification (cupule)

Crushed Stone Ballast

Crushed Limestone or Granite Aggregate

Slag

Metallurgical Slag

Moldavite

Tektite (Impact Glass), ~80% SiO2 + Al2O3

Slag (Industrial Glassy Byproduct)

Anthropogenic silicate byproduct (Slag)

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Iron Slag

Anthropogenic Vitreous Ferrous Silicate

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)