Fossiliferous Limestone Pebble
Calcite-rich Fossiliferous Marine Limestone
fossil
Category
Organic (Biological Organism)
Browse organic (biological organism) specimens identified by the Rock Identifier community.
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Amber
Succinite (fossilized tree resin)
fossil
Coal (Anthracite or Bituminous)
Carbonaceous sedimentary rock (Carbon)
sedimentary
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
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Fossilized Shark Tooth
Elasmobranchii gen. sp. indet. (Calcium Phosphate - Ca5(PO4)3(OH,F,Cl))
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
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Palm Wood Fossil
Palmoxylon
fossil
Petrified Wood (Silicified Fossil)
Silicified Wood (SiO2)
sedimentary
Limestone with Lichen/Moss
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone with Coral Imprint
Fossiliferous Limestone (CaCO3)
sedimentary
Fossilized Plant or Tree Bark
Lepidodendron or Sigillaria (example genera)
sedimentary
Limestone (River or Sea Cobble)
Calcium Carbonate (CaCO3)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Coal
Anthracite / Bituminous Coal
sedimentary
Baltic Amber
Succinite (Fossilized Tree Resin)
fossil
Fossilized Rugose Coral in Limestone
Order Rugosa in Sedimentary Matrix (CaCO3)
fossil
Coal
Anthracite or Bituminous Coal
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Fossil Shell Fragment (possibly Brachiopod or Bivalve)
Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
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
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Petrified Wood Fragment
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of Cellulose)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Chert (Chalcedony)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (composition: CaCO3)
sedimentary
Hag Stone
Perforated Sedimentary Rock (primarily Siltstone or Mudstone)
sedimentary