Knightia Fossil in Limestone
Knightia eocaena in micritic limestone
sedimentary
Category
Mineraloid (Organic)
Browse mineraloid (organic) specimens identified by the Rock Identifier community.
Fossiliferous Limestone with Rugose Coral
Lithostrotionella (Limestone Matrix - CaCO3)
sedimentary
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Amber (in Matrix/Shale)
Amber (Fossilized Tree Resin)
mineral
Turquoise and Red Coral
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)
mineral
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Paper (Cellulose)
Cellulose (C6H10O5)n
Organic (Anthropogenic)
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Amber (Copal)
Succinite (fossilized tree resin)
mineral
Amber
Succinite (fossilized tree resin), C10H16O
Organic Gemstone
Pearl
Calcium carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
sedimentary
Turquoise and Red Coral (with Grizzly Bear Claw)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)
mineral
Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Amber
Succinite (fossilized tree resin)
mineral
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Amber
Succinite
mineral
Amber
Succinates (Organic Fossilized Resin)
mineral
Oak-grain Laminate (Industrial/Decorative Furniture Finish)
Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)
not a rock (synthetic material)
Coquina / Limonite-stained Limestone
Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)
sedimentary
Amber / Fossilized Resin
Succinite / Fossilized Tree Resin
mineral
Onyx (Black) and Mother of Pearl Inlay
Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl
mineral
Stardust (Micrometeorite)
Chondrite / Micrometeorite (Extraterrestrial Silicate)
igneous
Moss Agate
Chalcedony (SiO2) with inclusions of hornblende or chlorite
mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Red Coral
Corallium rubrum
mineral
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Megalodon Shark Tooth (Partial Fossil)
Otodus megalodon (fossilized in Calcium Phosphate/Apatite)
Mineral/Fossil
Coal (Bituminous or Anthracite)
Carbonaceous sedimentary rock (primarily Carbon, C)
sedimentary
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Coquina (Fossiliferous Limestone)
Coquina (Organic Clastic Limestone)
sedimentary
Pearl
Organic Mineral (CaCO3 with conchiolin)
mineral
Coal (likely Bituminous or Lignite)
Organic Sedimentary Rock (Carbonaceous)
sedimentary
Red Coral (with Hematite and Black Pearl accents)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Travertine
Calcareous tufa (CaCO3)
sedimentary
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral