Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
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
View all →
Bivalve Fossil (Internal Mold)
Class Bivalvia (Phylum Mollusca)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineral
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Pumice
Pumicite (Amorphous glass with varying chemical composition, often rhyolitic)
Igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Calcite
Calcite (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Natural Freshwater Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
gemstone
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (containing fossil leaf impression)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Fossil Coral
Cnidaria fossil (often Calcium Carbonate / CaCO3)
sedimentary
Petrified Wood
Silicified wood / Xylopal
fossil
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Belemnite (Fossilized Rostrum)
Belemnitida (Order), composed of Calcite (CaCO3)
sedimentary
Limonite Geode (Ironstone Concretion)
Goethite/Limonite FeO(OH)·nH2O
sedimentary
Conglomerate with Fossilized Shark Teeth
Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains
sedimentary
Pearl (Cultured or Natural)
Aragonite (CaCO3) with Conchiolin
Organic Mineraloid
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Banded Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Amber (Rough)
Amber (Fossilized Tree Resin, succinite)
mineral
Coral Skeleton (Scleractinia)
Aragonite (CaCO3) biomineralisation within Anthozoa
fossil
Chert (likely Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Oyster shell fragment
Ostreidae shell; primarily calcite (CaCO₃)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Fossil Shark Tooth
Chondrichthyes dentition (Fossilized Tooth)
fossil
Fossilized Coral (Petoskey Stone / Favosites)
Hexagonaria percarinata / Favosites sp. (Calcite, CaCO3)
fossil
Amber (Rough Baltics/Beach Specimen)
Succinicum (Organic Gemstone - Fossilized Resin)
mineral
Chert / Chalcedony Nodule
Silicon Dioxide (SiO2)
sedimentary
Amber (Baltic)
Succinith (Fossilized Tree Resin)
mineraloid
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
metamorphic
Crinoid Stem Fossil
Class Crinoidea (Echinodermata)
fossil
Amber
Succinite (C10H16O)
mineral
Crazy Lace Agate
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
mineral
Amber
Succiniferous organic material (Succinite)
fossil
Chert / Flint (with Iron Staining)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary