Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2)
metamorphic
Category
Mineral (Biogenic Replacement)
Browse mineral (biogenic replacement) specimens identified by the Rock Identifier community.
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified wood (SiO2)
fossil
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Sphalerite
Zinc sulfide (Zn, Fe)S
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Galena with Pyrite
Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)
mineral
Fossilized Echinoid (Sea Urchin) or Brachiopod
Echinoidea / Invertebrate Fossil
fossil
Chert (Jasper variety)
Silicon dioxide (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Goethite/Hematite Nodule
Goethite (FeO(OH)) and Hematite (Fe2O3)
mineral
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Chalcedony (Milky Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite-rich Ore
Pyrite (FeS2) with secondary minerals
mineral
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Calamites (Fossil)
Calamites sp. (Tracheophyta, Equisetopsida)
sedimentary
Fossilized Shark Tooth (Sand Tiger)
Carcharias taurus (fossil specimen)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Fossilized Shark Tooth
Elasmobranchii (Class) fossil
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Unakite Epidote-Granite
Unakite (Epidotized Granite)
metamorphic
Coprolite
Coprolite
sedimentary
Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
sedimentary
Rhodonite
Manganese silicate: (Mn,Fe,Mg,Ca)SiO3
mineral