Pyrite (Fool's Gold) in Matrix
Iron Disulfide (FeS2)
mineral
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
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Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Gastropod Fossil
Class Gastropoda (fossilized)
fossil
Calamites (Fossil)
Calamites sp. (Tracheophyta, Equisetopsida)
sedimentary
Fossilized Shark Tooth (Sand Tiger)
Carcharias taurus (fossil specimen)
sedimentary
Fossilized Echinoid (Sea Urchin) or Brachiopod
Echinoidea / Invertebrate Fossil
fossil
Fossil shark tooth
Likely fossilized shark tooth, possibly *Carcharocles* or *Otodus* species
fossil
Fossil bivalve shell
Fossilized mollusk (Bivalvia), likely oyster or related species; exact genus requires locality and preparation
fossil
Chert (or Flint)
Chert (microcrystalline or cryptocrystalline quartz, SiO2)
Sedimentary
Fossilized Bone Chunk
Permineralized Vertebrate Bone (indeterminant)
fossil
Fossilized Gastropod Shell
Class Gastropoda (Fossil)
sedimentary
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Pyrite in Matrix (Healers Gold / Pyrite Egg)
Iron Disulfide (FeS2) with Magnetite/Hematite matrix
mineral
Chalcedony in Matrix (likely Agatized Coral or Chert)
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Celestine (Celestite)
Celestine (Strontium Sulfate, SrSO4)
mineral
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Jasper
Silicon dioxide, SiO2
Mineral
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Gneiss
Metamorphic Gneiss
metamorphic
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Chert with Druzy Quartz and Mossy/Iron Inclusions
Microcrystalline Quartz (SiO2)
sedimentary
Fossil bone or tooth fragment
Indeterminate fossilized vertebrate bone/tooth; taxonomic identification is not possible from this blurred image
fossil
Chalcedony
Silicon Dioxide (SiO2)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Yellow Chert (Yellow Jasper)
Silicon dioxide (SiO2)
sedimentary
Fossil Coral
Cnidaria Anthozoa (Fossilized)
sedimentary
Seashell Fossil
Gastropoda fossil
fossil
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Black Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Fossilized Coral
Rugose Coral / Hexagonaria (Fossilized calcium carbonate)
fossil
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite with Magnetite
Iron Oxide (Fe2O3)
mineral
Gneiss (Metamorphic Pebble)
Gneissic Metamorphic Rock
metamorphic
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil