Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
Learn about Mineral Like Biological Tissue in the encyclopedia
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Pyrite
Iron Sulfide (FeS2)
mineral
Fossilized shark tooth
Shark tooth fossil, likely *Otodus megalodon* or a related lamniform shark
fossil
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Pearl
Calcium carbonate (Aragonite/Calcite) - CaCO3
gemstone
Amethyst, Aquamarine, and Pearl Ring
SiO2 (Amethyst), Be3Al2Si6O18 (Aquamarine), CaCO3 (Pearl)
gemstone
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
metamorphic
Polished fossiliferous limestone, likely fossil shell fragment
Calcite-rich limestone (CaCO₃), possibly bioclastic/coquina limestone
fossil
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Likely fossilized shell or bone fragment
Indeterminate bioclast; possibly silicified/bioapatite-bearing shell or bone
fossil
Fossil Coral
Cnidaria fossil (often Calcium Carbonate / CaCO3)
sedimentary
Amber
Succinite (fossilized resin)
Organic Mineraloid
Sandstone with Trace Fossils
Arenite with Ichnofossils
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Calcite
Calcite (CaCO3)
mineral
Fossilized coral or bryozoan fragment
Indeterminate colonial coral/bryozoan fossil; likely calcitic calcium carbonate (CaCO₃)
fossil
Fossilized Brachiopod
Brachiopoda (likely Order Spiriferida or Productida)
fossil
Fossil-bearing limestone slab
Bioclastic limestone, likely containing brachiopod or bivalve impressions
fossil
Fossil Shark Tooth
Chondrichthyes dentition (Fossilized Tooth)
fossil
Fossiliferous shale or mudstone with plant fossils
Carbonaceous mudstone/shale containing fossilized foliage, likely fern or seed-fern impressions
fossil
Petrified Wood
Silicified wood / Xylopal
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Amber (Rough)
Amber (Fossilized Tree Resin, succinite)
mineral
Amber (Rough Baltics/Beach Specimen)
Succinicum (Organic Gemstone - Fossilized Resin)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Marine gastropod shell
Calcareous mollusk shell, primarily aragonite (CaCO₃), likely a whelk or conch
fossil
Limonite Geode (Ironstone Concretion)
Goethite/Limonite FeO(OH)·nH2O
sedimentary
Likely fossil shell fragment
Indeterminate mollusk fossil; possibly a gastropod or bivalve in limestone
fossil
Crinoid Stem Fossil
Class Crinoidea (Echinodermata)
fossil
Oyster shell fragment
Ostreidae shell; primarily calcite (CaCO₃)
fossil
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Pink shell fragment
Calcium carbonate, likely aragonite or calcite (CaCO₃); probably a bivalve or gastropod shell fragment
fossil
Amber (Baltic)
Succinith (Fossilized Tree Resin)
mineraloid
Amber
Succinite (C10H16O)
mineral
Belemnoit (Fossil)
Belemnoidea (Order), Rostrum / Guard
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (poss. Order Spiriferida or Rhynchonellida)
fossil
Fossil or modern bivalve shell
Calcium carbonate shell, likely aragonite (CaCO₃); exact species cannot be determined from the image
fossil
Lava Rock Substrate
Scoria (Basaltic Rock)
igneous
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Organic Gemstone (Sedimentary classification)