Opalite crescent pendant
Opalite (man-made opalescent glass; not a natural mineral)
Category
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
Opalite crescent pendant
Opalite (man-made opalescent glass; not a natural mineral)
Pyrite Concretion (Grapestone)
Iron Sulfide (FeS2) Concretion
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
Faceted clear gemstone, likely quartz or glass imitation
Most likely quartz (SiO₂); exact identification requires refractive-index and hardness tests
Polished dendritic agate or jasper
Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
Sandstone
Sedimentary Rock (Quartz Sandstone)
Chert (Flint)
Microcrystalline quartz (SiO2)
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
Vesicular basalt (probable iron-rich volcanic rock)
Basalt; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides
Asphalt Pavement (with aggregate)
Asphalt concrete
Blue Goldstone
Goldstone (artificial glass)
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
Sandstone
Arenite
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
Red Sandstone
Arenite (Fe2O3 enriched)
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
Asphalt aggregate
Human-made bituminous asphalt containing crushed silicate rock aggregate
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Cullet (Slag Glass)
Amorphous Silica (Industrial byproduct)
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
Limestone
Calcareous sedimentary rock (CaCO3)
Slag (Industrial Glassy Byproduct)
Anthropogenic silicate byproduct (Slag)
White pebbles (rock material not identifiable from the image)
Undetermined; the smooth, pale pieces could be quartz, quartzite, or another light-colored rock
Black glassy fragment, likely obsidian or industrial glass
Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image
Blue obsidian-like volcanic glass
Volcanic glass, chiefly silica-rich amorphous material (composition uncertain)
Opalite
Synthetic Glass (Simulated Moonstone/Opal)
Goldstone beads (likely brown goldstone)
Man-made copper-bearing glass; not a natural mineral. Often sold as “aventurine glass.”
Chert (possibly a worked stone flake)
Microcrystalline quartz, SiO₂
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
Botryoidal chalcedony (likely agate/jasper variety)
Microcrystalline quartz, SiO₂
Pink Cubic Zirconia (CZ)
Zirconium Dioxide (ZrO2)
Carborundum
Silicon Carbide (SiC)
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
Chalk
Calcium carbonate (CaCO3)
Green sea glass (likely bottle glass)
Man-made soda-lime silicate glass; not a natural mineral
Chert Arrowhead
Microcrystalline Quartz (SiO2)
Sandstone
Sedimentary Rock (Quartz Sandstone)
Flint (chert)
Microcrystalline quartz (SiO₂), commonly called chert or flint
Clear quartz crystal (likely)
Quartz, silicon dioxide (SiO₂)