Coquina
Biogenic calcarenite / Coquina (CaCO3)
sedimentary
Category
Mineral (Biogenic)
Browse mineral (biogenic) specimens identified by the Rock Identifier community.
Learn about Mineral (Biogenic) in the encyclopedia
View all →
Fossiliferous Limestone Pebble
Biogenic Sedimentary Rock (CaCO3)
fossil
Coquina
Coquina (Biogenic Limestone / CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Fossiliferous Limestone (Gastropod / Crinoid Fossil Rock)
Biogenic Sedimentary Rock (CaCO3)
fossil
Coal
Biogenic sedimentary rock (Carbon)
sedimentary
Fossiliferous Limestone
Biogenic Calcium Carbonate (CaCO3)
sedimentary
Coquina
Biogenic Limestone (Calcite, CaCO3)
sedimentary
Coralline Algae / Maerl
Lithothamnion (Biogenic Calcium Carbonate)
sedimentary
Fossiliferous Limestone
Biogenic Calcium Carbonate (CaCO3)
sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite)
sedimentary
Banded Chert / Agate
Silicon Dioxide (SiO2)
sedimentary
Beaded mineral/crystal jewelry (likely turquoise and coral accents)
Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials
gemstone
Chert (Arrowhead Point)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous limestone, likely coral or shell-rich limestone
Biogenic calcite (CaCO₃), commonly limestone containing fossil coral or mollusks
fossil
Coral Fossil / Coral Fragment
Scleractinia / Calcium Carbonate (CaCO3)
fossil
Pearl
Calcium Carbonate (Aragonite) - CaCO3
mineral
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Chert (or Fossiliferous Limestone)
Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)
sedimentary
Weathered fossil shell fragment
Likely molluscan shell, composed mainly of calcium carbonate (aragonite or calcite); exact taxon is indeterminate from the image
fossil
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Pearl; primarily aragonite (CaCO₃) with conchiolin
gemstone
Chert (Smoky Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint / Jasper / Hornstone)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Chert (Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint / Agate Nodule)
Silicon Dioxide (SiO2)
sedimentary
Jasper (or Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint (or lithic artifact flake)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineraloid
Pearl (in a decorative hair comb setting)
Calcium carbonate (CaCO3) primarily as Aragonite, bonded with Conchiolin
Organic Mineraloid
Chert (and Fossiliferous Limestone)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Calcite (CaCO3)
sedimentary
Coquina (Fossiliferous Limestone)
Biogenic Limestone (mostly CaCO3 / Calcium Carbonate)
sedimentary
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in Sedimentary Matrix (CaCO3)
fossil
Coquina / Fossiliferous Limestone
Fossiliferous Limestone / CaCO3
sedimentary