Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Schist with Quartz Veins
Schist with Quartz (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (specifically Red Sandstone)
Arenite (SiO2 with Iron Oxide)
sedimentary
Sandstone (Red)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Basalt (River Pebble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Shale
Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)
sedimentary
Sandstone
Sandstone (Clastic Sedimentary Rock)
Sedimentary Rock
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Yellow Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Conglomerate with Fossilized Shark Teeth
Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Greenschist
Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Honey Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Diamond
Diamond (pure carbon, C)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Chert (Jasper/Iron-stained Quartzite)
Silicon Dioxide (SiO2)
sedimentary
Chert (containing Flint and Calcareous inclusions)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) impurities
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
sedimentary and metamorphic
Coquina / Fossiliferous Limestone
Calcite-rich Bioclastic Sedimentary Rock (CaCO3)
sedimentary
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Chert (Pebble)
Microcrystalline to Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Chert (Chert/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Graphic Granite
Pegmatitic Granite (Quartz and Microcline K-Feldspar mixture)
igneous