Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Category
Browse sedimentary (biogenic) specimens identified by the Rock Identifier community.
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Calcite
Calcium Carbonate (CaCO3)
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Fossiliferous Limestone
Limestone with fossil inclusions (CaCO3)
Mookaite Jasper
Silicified Radiolarite (SiO2)
Chalk (Sedimentary Pebble)
Calcium Carbonate (CaCO3) - Biogenic Limestone
Chert (Flint)
Microcrystalline or cryptocrystalline quartz (SiO2)
Spondylus Oyster Calcification / Fossilized Oyster
Spondylus (Thorny Oyster) / Calcium Carbonate (CaCO3)
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
Coquina or Fossiliferous Limestone
Biogenic Limestone (Calcite/Aragonite CaCO3)
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Coquina / Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate - CaCO3)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (Crinoidal Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (containing Brachiopods)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Coquina Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (Coquina / Shell Bed)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
Stromatolite (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)