Amber
Succinite (C10H16O)
mineraloid
Category
Organic (Biological Organism)
Browse organic (biological organism) specimens identified by the Rock Identifier community.
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Coal (Bituminous or Anthracite)
Carbonaceous sedimentary rock (primarily Carbon, C)
sedimentary
Limestone with Fossil Inclusion
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Megalodon Shark Tooth (Partial Fossil)
Otodus megalodon (fossilized in Calcium Phosphate/Apatite)
Mineral/Fossil
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Polished petrified wood
Silicified wood; primarily microcrystalline quartz (SiO₂) replacing woody tissue
fossil
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amber (Green variation)
Succinite
fossil
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Petrified Wood
Fossilized plant material (Silicon dioxide - SiO2)
fossil
Red Coral
Corallium rubrum
mineral
Shale (or Slate / Coal / Jet)
Laminated fine-grained sedimentary rock (predominantly clay minerals)
sedimentary
Sandy Ironstone
Ferruginous Sandstone
sedimentary
Fossil coral fragment
Likely fossilized colonial coral; exact taxon cannot be determined from the fragment
fossil
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Black Limestone with Calcite Veining
Bituminous Limestone (CaCO3 with Organic Carbon inclusions)
sedimentary
Amber cabochon pendant
Amber (fossilized tree resin; chiefly polymerized terpenoids)
gemstone
Petrified wood
Silicified wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Pearl
Pearl; primarily aragonite (CaCO₃) with conchiolin
gemstone
Fossilized tooth, likely a mammalian tooth fragment
Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth
fossil
Fossiliferous Limestone Pebble
Calcite-rich Fossiliferous Marine Limestone
fossil
Fossilized Shark Tooth
Elasmobranchii gen. sp. indet. (Calcium Phosphate - Ca5(PO4)3(OH,F,Cl))
fossil
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Fossilized Chiton (Polyplacophora)
Polyplacophora (fossilized valves)
mineralized fossil
Onyx (Black) and Mother of Pearl Inlay
Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl
mineral
Petrified Wood
Fossilized Wood (SiO2 replacing organic matter)
fossil
Black Onyx
Cryptocrystalline Quartz (SiO2 with organic/iron impurities)
mineral
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Petrified Wood
Silicon Dioxide (SiO2) permineralized organic matter
sedimentary
Mother of Pearl (Nacre)
Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers
mineral
Blue Agate (Tumbled and Dyed)
Silicon Dioxide (SiO2) with likely organic dyes
mineral
Amber
Succinite (fossilized tree resin)
fossil
Coal (Anthracite or Bituminous)
Carbonaceous sedimentary rock (Carbon)
sedimentary
Pearl
Nacre (aragonite, CaCO₃, with conchiolin)
gemstone
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Pyritized Ammonite
Ammonitida (replaced by Iron Disulfide, FeS2)
sedimentary
Turquoise and Red Coral (with Grizzly Bear Claw)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)
mineral
Fossilized bivalve shell
Calcitic or aragonitic mollusk shell, commonly Bivalvia; exact species indeterminate
fossil
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Fossilized Shell Fragment / Mother of Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral
fossil