Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Fossil
Browse fossil specimens identified by the Rock Identifier community.
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Chert (vuggy variety)
Microcrystalline silica (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-oxide cemented)
sedimentary
Chert (often called Flint or Jasper if reddish)
Microcrystalline Quartz (SiO2)
sedimentary
River Pebble (Siltstone/Mudstone)
Clastic sedimentary rock
sedimentary
Chert (specifically a nodule with Chalcendony/Agate banding)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Stromatolite
Laminated biogenic sedimentary structure (formed by Cyanobacteria)
sedimentary
Shale
Mudstone/Shale
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Shale
Argillite / Shale
sedimentary
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Shale (Ferruginous)
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
River Siltstone Pebble
Siltstone (primarily composed of silica and clay minerals)
sedimentary
Ironstone Pebble
Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Shale or Siltstone
Sedimentary Rock (Siliciclastic)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2 - Silicon Dioxide)
metamorphic
Limestone (Flagstone)
Fossiliferous Limestone (CaCO3)
sedimentary
Milky Quartz (polished heart)
Quartz (Silicon Dioxide, SiO2)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Fossilized Sand Tiger Shark Tooth
Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)
sedimentary (fossil)
Red Sandstone
Arenite with Hematite cementation
sedimentary
Flesh-toned Siltstone
Siltstone (composed of microscopic Quartz and Feldspar grains)
sedimentary
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Sandstone (Greywacke)
Arenite / Wacke (Mainly SiO2 with various lithic fragments)
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Chert (variations include Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary