Chert (Flinty variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Anthropogenic (Man Made Material)
Browse anthropogenic (man made material) specimens identified by the Rock Identifier community.
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Chert (specifically Black Chert or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Granite (a plutonic rock)
Igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Chert (Arrowhead Debitage or Flake)
Microcrystalline silica (SiO2)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Chert (specifically Jasper or Flint variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Diamond (in jewelry setting)
Diamond (C - Carbon)
mineral
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Ferro-Manganese Slag
Vitreous Silicate Slag
Anthropogenic (Industrial byproduct)
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
sedimentary
Rough Diamond
Diamond (Pure Carbon: C)
mineral
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Chert (Iron-stained)
Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Common Marble
Calcium Carbonate (CaCO3)
metamorphic
Slag (Industrial Glass)
Anthropogenic Vitreous Slag (Post-industrial byproduct)
igneous
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
sedimentary
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural