Amber (Rough)
Succinite (Resinite)
gemstone
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
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Banded gneiss
Gneiss, typically quartz–feldspar–mica assemblage
metamorphic
Fossiliferous Limestone (Coquina / Shell Limestone Egg)
Biogenic Limestone (composed primarily of Calcite, CaCO3)
sedimentary
Beach Pebbles and Quartz Aggregates
Quartz pebbles and biogenic fragments (SiO2, CaCO3)
sedimentary
Coquina
Biogenic Limestone (mostly Calcium Carbonate, CaCO3)
sedimentary
Rounded flint or chert pebble
Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities
sedimentary
Crinoid Fossil Marble
Crinoidal Limestone / Phylum Echinodermata
sedimentary
Chert (Flint) / Silicified Limestone
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized coral fragment
Fossil scleractinian coral; commonly calcite/aragonite replaced by calcite (CaCO₃)
fossil
Fossilized coral or bryozoan limestone
Calcitic fossiliferous limestone; likely colonial coral/bryozoan fragments, CaCO₃
fossil
Scallop Shell Fossil
Pecten sp.
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Green Calcite
Calcite (CaCO3)
mineral
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Chert / Flint Pebble
Chert (SiO2)
sedimentary
Chert (specifically Flint or Gray Chert)
Silicon Dioxide (SiO2)
sedimentary
Selenite desert rose
Gypsum (CaSO₄·2H₂O), rosette habit
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert / Flint (Brecciated or Fossiliferous Limestone with Silicification)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert / Chalcedony Nodule
Silicon Dioxide (SiO2)
sedimentary
Likely fossil shell fragment
Indeterminate mollusk fossil; possibly a gastropod or bivalve in limestone
fossil
Fossilized Shell or Coral Fragment in Matrix
Invertebrate Fossil in Sedimentary Rock
fossil
Small marine shell fragment
Calcareous shell, primarily calcium carbonate (aragonite or calcite); exact taxon indeterminate
fossil
Chert (Jasper/Carnelian variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Teeth in Matrix
Cretaceous Chondrichthyes (Shark) remains in Sedimentary Matrix
fossil
Polished/tumbled chert or jasper pebble
Microcrystalline quartz (SiO₂), likely brown jasper/chert
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Amber
Succinate (Fossilized Resin)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Likely tumbled yellow calcite or aragonite
Calcite (CaCO₃) or aragonite (CaCO₃)
mineral
Fossiliferous Limestone
Biogenic Limestone containing marine invertebrate fossils
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Limestone
CaCO3 (Mainly Calcite or Aragonite)
sedimentary
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Ironstone concretion
Iron-oxide-cemented sedimentary concretion, commonly composed of goethite and/or hematite with quartz or clay
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Gravel or Pebble
Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)
sedimentary