Brachiopod or Bivalve Fossil in Limestone
Phylum Brachiopoda or Bivalvia (embedded in Calcium Carbonate matrix)
fossil
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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Shungite
Fullerene-bearing carbonaceous rock
mineral
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineraloid
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Fragments
sedimentary
Crinoid and Coral Fossils in Limestone
Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Natural White Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3
mineraloid
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Obsidian and Fossilized Shark Tooth
Obsidian (Volcanic Glass) and Otodus sp. (Fossilized shark tooth)
igneous and fossil
Marble (Sculpted Statue)
Metamorphic Limestone (composed primarily of Calcite, CaCO3)
metamorphic
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin
gemstone
Marine invertebrate fossils (Brachiopods and Gastropods)
Phylum Brachiopoda and Class Gastropoda
fossil
Fossilized Syringopora (Piping Organ Coral)
Syringopora (Extinct Genus of Tabulate Coral)
sedimentary
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate - CaCO3
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (BIF), SiO2 / Fe2O3
sedimentary
Chert (Black Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Crinoidal Limestone
Fossiliferous Limestone containing Crinoid stem fragments (Echinodermata)
fossil
Chert (Flint Nodules)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert / Fossilized Burrow Cast
Microcrystalline Quartz (SiO2) with Trace Carbonates
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Amber
Succinite (fossilized tree resin)
mineraloid
Fossilized Shark Tooth or Bone Fragment
Vertebrate Fossil (likely Carcharodon or similar genus)
fossil
Kidney Stone (Renal Calculus)
Calcium oxalate monohydrate (Whewellite) / CaC2O4·H2O
mineral
Fossilized Crinoid Stem
Class Crinoidea (Echinodermata)
sedimentary
Moss-covered Limestone with Quartz/Calcite Pocket
Calcium Carbonate (CaCO3) rock with biological moss coating
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Olive Sea Shell Fossil
Oliva sp. (Calcium Carbonate, CaCO3)
fossil
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Black Pearl (Tahitian Type)
Aragonite / Conchiolin composite (CaCO3)
mineraloid
Chert (Siliceous Mudstone variant)
Microcrystalline quartz (SiO2)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Fossiliferous Limestone (containing Brachiopods)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone (containing Fossil Mold)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil