Sandstone with Tafoni Weathering
Arenite (SiO2 based)
Category
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
Sandstone with Tafoni Weathering
Arenite (SiO2 based)
Red Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Red Sandstone
Sandstone (Iron Oxide Rich)
Weathered iron-rich rock, possibly limonite-bearing sandstone or laterite
Limonite/goethite-rich ferruginous rock; exact identification requires testing
Chert (specifically Pink/Tan Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Bumblebee Jasper
Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)
Honey calcite (likely rough cleavage fragment)
Calcite, calcium carbonate (CaCO₃)
Red Sandstone
Arenite (SiO2 with Fe2O3)
Sandstone
Arenite (SiO2-rich)
Sandstone (Red Sandstone)
Arenite (primarily Quartz with Hematite cement)
Coquina
Coquina (Bioclastic Calcarenite)
Sandstone with Iron Staining
Arenite (SiO2 based with Fe2O3 staining)
Chert (Iron-stained)
Silicon Dioxide (SiO2) with Ferruginous impurities
Rounded dark river pebble
Likely fine-grained basalt or andesite; exact identification requires a fresh surface or tests
Sandstone
Arenite (SiO2 principal component)
Limestone Boulder
Sedimentary Rock (Calcium Carbonate, CaCO3)
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3)
Banded Gneiss
Metamorphic Gneiss
Sandstone with Iron Weathering
Quartz Arenite / Weathered Sandstone
Quartz
Silicon Dioxide (SiO2)
Chert Nodule
Microcrystalline Silica (SiO2)
Biotite Schist
Biotite Mica Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
Quartz Geode
Silicon Dioxide (SiO2) within a geode
Chert (Yellow/Tan)
Microcrystalline Quartz (SiO2)
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
Green Jasper
Silicon Dioxide (SiO2) with impurities
Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Fossilized Shark Tooth
Chondrichthyes (Class)
Ferruginous Sandstone (Ironstone)
Ferruginous arenite
Limestone
Sedimentary carbonate rock (CaCO3)
Conglomerate
Conglomerate (clastic sedimentary rock)
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
Conglomerate
Conglomerate (clastic sedimentary rock)
Sandstone
Arenite (clastic sedimentary rock)
Conglomerate
Conglomerate (Detrital sedimentary rock)
Conglomerate
Conglomerate (clastic sedimentary rock)
Conglomerate
Conglomerate (clastic sedimentary rock)
River Pebble (Quartzite / Chert)
Silicon Dioxide (SiO2)
Petrified Wood
Silicified Wood (SiO2)