Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Category
Man Made Material (Anthropogenic 'Mineraloid')
Browse man made material (anthropogenic 'mineraloid') specimens identified by the Rock Identifier community.
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Diorite (Gneissic)
Diorite
igneous
Chert (and/or Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Coquina
Biogenic Limestone (Calcite, CaCO3)
sedimentary
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Chert (often called Flint)
Chert (SiO2)
sedimentary
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Green Slag Glass
Amorphous Silicon Dioxide (with metallic impurities)
Igneous (Anthropogenic)
Chert (Nodule)
Chert (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Limonite (Iron Ore)
Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)
Mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Ferrochrome Slag
Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)
Industrial byproduct (often confused with igneous rocks or meteorites)
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
sedimentary
Chert (often called Flint for darker varieties)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (and Jasper/Chalcedony mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically White Chert or Novaculite)
Silicon Dioxide (SiO₂)
sedimentary
Sandstone
Arenite
sedimentary
Natural or Cultured Pearl
Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Mineral (Organic)