Chert (Flint variety)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Tumbled green aventurine
Quartzite dominated by quartz (SiO₂), with green mica/fuchsite inclusions
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Murex Fossil
Muricidae (Calcium Carbonate fossilization)
fossil
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Tumbled orange chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Likely weathered quartz-rich stone
Probably quartz-bearing sandstone or milky quartz; exact identification requires testing
mineral
Basalt River Pebble
Basalt
igneous
Diamond (or Simulant)
Carbon (C)
gemstone
Diamond (Faceted)
Carbon (C)
gemstone
Basalt (River Pebble)
Basalt
igneous
Diamond
C (Carbon)
mineral
Granite Sand and Gravel Mix
Phaneritic Felsic Igneous Plutonic Assemblage
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Vein in Sandstone
Quartz (SiO2) in Clastic Sedimentary Rock
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Chert (Field-collected variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Tumbled carnelian/chalcedony
Cryptocrystalline quartz, SiO₂ (iron-bearing chalcedony)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Chert (often called Flint or Jasper)
Cryptocrystalline quartz (SiO2)
sedimentary
Limestone Gravel
Calcium Carbonate (CaCO3)
sedimentary
Jasper (Banded Argillite/Chert mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen)
Quartz, SiO₂, in an unidentified dark silicate matrix
mineral
Tumbled carnelian (probable)
Cryptocrystalline silica, mainly chalcedony (SiO₂), colored orange-red by iron oxides
gemstone
Magnetite-rich iron ore
Magnetite (Fe₃O₄), possibly with hematite and silicate matrix
mineral
Rhodochrosite
Rhodochrosite, Manganese Carbonate (MnCO3)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
C (Carbon)
mineral
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Blue quartzite or blue aventurine glass-like aggregate
Quartzite, predominantly SiO₂ (identification uncertain from image)
metamorphic