Anthropogenic Material (Man Made Sedimentary Mimic)

Browse anthropogenic material (man made sedimentary mimic) specimens identified by the Rock Identifier community.

Chert (often called Flint when dark)

Microcrystalline silicon dioxide (SiO2)

sedimentary

Chert (often called Flint or Jasper)

Cryptocrystalline quartz (SiO2)

sedimentary

Chert (Flint)

Chert (SiO2)

sedimentary

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Chert (and Limestone) River Cobble

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

sedimentary

Coquina with Shell Fragment

Bioclastic Limestone (composed primarily of CaCO3)

sedimentary

Chert (Jasper)

Microcrystalline Quartz (SiO2) with Iron Oxide inclusions

sedimentary

Chert (Jasper/Flint variant)

Microcrystalline Quartz (SiO2)

sedimentary

Chert (and Fossilized Brachiopod shell)

Sedimentary Cryptocrystalline Quartz (SiO2)

sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary

Chert

Microcrystalline Quartz (SiO2)

sedimentary

Chert

Microcrystalline Quartz (SiO2)

sedimentary

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

sedimentary

Petrified Wood

Silicified Wood (SiO2)

metamorphic

Sandstone

Arenite (SiO2 based with various mineral cements)

sedimentary

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

sedimentary

Chert (Field-collected variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

sedimentary

Siltstone

Siltstone (primarily SiO2, Al2O3)

sedimentary

Conglomerate

Conglomerate (a clastic sedimentary rock)

Sedimentary

Agatized Fossil (Druzy Agate)

Silicon Dioxide (SiO2) replacing organic matter

sedimentary

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

sedimentary

Puddingstone (Conglomerate)

Conglomerate (clastic sedimentary rock)

sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)

sedimentary

Kyanite

Kyanite (Al2SiO5)

mineral

Diamond Plate (Steel)

Alloyed Carbon Steel or Aluminum with 'Durbar' pattern

not a rock (Man-made industrial metal)

Blue Goldstone

Aventurine Glass (Silicon Dioxide with metal inclusions)

man-made glass mineral simulant

Green Aura Quartz (Titanium treated Kyanite or Quartz)

Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating

mineral (man-made aura treatment)

Flint (within Limestone matrix)

Silicon dioxide (SiO2)

sedimentary

Grey Jasper (Tumbled Quartz variant)

Jasper (Silicon Dioxide, SiO2)

sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

mineral

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Sedimentary rock