Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic (Sedimentary Context)
Browse organic (sedimentary context) specimens identified by the Rock Identifier community.
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Limestone with Lichen
Calcium Carbonate (CaCO3) with Endolithic/Epilithic Lichen
sedimentary
Orthoceras Fossil Limestone
Orthoceras (extinct Cephalopod fossil) in Matrix
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
sedimentary
Coquina / Shelly Limestone
Coquina (Biogenic Limestone)
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Amber
Succinates (Fossilized Tree Resin)
fossil
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Limestone
Calcium Carbonate (CaCO3 - Calcite)
sedimentary
Glauconitic Sandstone
Glauconite-bearing Arenite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Banded Chert with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Fish Skeleton in Matrix
Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Chert (v. Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes tooth fossil
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Amber
Fossilized Tree Resin (Succinate)
mineral
Petrified Wood
Silicified wood (Quartz, SiO2)
fossil
Melo Melo Pearl (or Golden Chalcedony / Yellow Jasper Sphere)
Non-nacreous calcium carbonate pearl (or SiO2 - Silicon Dioxide)
gemstone
Sand Tiger Shark Tooth Fossil
Carcharias taurus (fossilized tooth)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2)
mineral
Weathered dark flint (chert) pebble
Microcrystalline quartz (SiO₂), commonly called flint or chert
sedimentary
Sandstone Chert Concretion
Silica-cemented Concretion (primarily SiO2)
sedimentary
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
sedimentary
Chert (specifically Gray Chert)
Silicon Dioxide (SiO2)
sedimentary
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Chert / Flint (with Crinoid Stem Molds)
Microcrystalline Quartz (SiO2)
sedimentary
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Heart-shaped Jasper / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Chert (Jasper/Chalcedony pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (or Fossiliferous Limestone)
Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary