Coquina (Fossiliferous Limestone)
Coquina (Organic Clastic Limestone)
sedimentary
Category
Organic Gemstone (Sedimentary Classification)
Browse organic gemstone (sedimentary classification) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Sedimentary Classification) in the encyclopedia
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Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Shale
Fissile Mudstone (Shale)
sedimentary
Fossil Shark Tooth
Selachii fossil
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Fossil Shell (Brachiopod or Mollusk)
Phylum Brachiopoda or Class Bivalvia (e.g., Mucrospirifer or similar genus)
fossil
Plume Agate
Cryptocrystalline Quartz (SiO2)
Mineral/Gemstone
Limestone Pebble
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Seashell Fossil
Gastropoda fossil
fossil
Mookaite Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2)
mineral
Heart-shaped Limestone
Calcium Carbonate (CaCO3)
sedimentary
Coquina / Shelly Sandstone
Calcareous Sandstone / Coquina
sedimentary
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Quartz and Limestone Grouping
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
mineral
Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Glauconitic Sandstone
Glauconitic Sandstone (Greensand)
sedimentary
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Chert (Common Opal/Jasper mix)
Silicon Dioxide (SiO2) with impurities
sedimentary
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone pebble
Sedimentary rock, primarily calcium carbonate (CaCO3)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Flint
Microcrystalline Quartz (SiO2) with Echinoid Fossil
sedimentary
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Limestone (with possible Crinoid or Fossil Impression)
Calcium Carbonate (CaCO3) / Calcite
sedimentary
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Jasper variation)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Shungite
Carbon-rich mineraloid (Amorphous carbon)
mineral
Fossilized Shell
Invertebrate fossil (Bivalvia or Brachiopoda)
fossil