Amber
Succinite (specifically for Baltic amber); Complex mixture of organic compounds (C10H16O)
Organic Mineraloid
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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Fossiliferous Limestone Pebble
Limestone with fossil inclusion
sedimentary
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock / CaCO3 with fossil fragments
sedimentary
Coquina or Coral Fossil
Biogenic Limestone (Calcite/Aragonite)
sedimentary
Coquina
Biogenic Limestone (Calcite, CaCO3)
sedimentary
Coquina
Biogenic Limestone (Calcite, CaCO3)
sedimentary
Coquina
Biogenic Limestone (Calcite / CaCO3)
sedimentary
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Calcite
Calcite (CaCO3)
Mineral
Staghorn Coral Specimen
Acropora cervicornis (Calcium Carbonate, CaCO3)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper / Flint)
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Tiger's Eye (Oeil de Tigre)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Chert (Flint Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous limestone (likely stromatoporoid/coral limestone)
Calcite-rich carbonate rock, chiefly CaCO₃; visible fossil structures may be tabulate coral or stromatoporoid
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Otodus sp. (possibly Otodus obliquus)
fossil
Limestone (River Stone)
Calcium Carbonate (CaCO3)
sedimentary
Tumbled yellow calcite (probable)
Calcite — calcium carbonate, CaCO₃
mineral
Chert
Channery Chert (Microcrystalline Quartz)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Geode (unopened)
Silica-filled Concretion (SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shark Tooth (Cretaceous to Neogene)
Elasmobranchii dental fossil (likely Squalicorax or similar species)
mineral (biogenic replacement)
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Orbicular jasper (orbicular chert/jasper)
Silica-rich microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
sedimentary
Coquina (Limestone)
Bioclastic Limestone (CaCO3)
sedimentary
Fossil tooth, likely mosasaur or large marine reptile tooth
Fossilized reptilian tooth; exact taxon requires diagnostic views and locality
fossil
Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Chalk / Sedimentary Limestone
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Chalk (Calcitic)
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary