Fossilized wood fragment
Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)
fossil
Category
Organic Gemstone (Fossilized Resin)
Browse organic gemstone (fossilized resin) specimens identified by the Rock Identifier community.
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Crinoid Stem Fossil (Indian Bead)
Crinoid ossicle (Echinodermata)
fossil
Fossilized Coral
Cnidaria (Hexacorallia)
fossil
Fossilized Coral
Anthozoa (Fossilized)
Sedimentary / Fossil
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Amazonite (Tumbled Chips)
Potassium Feldspar (KAlSi3O8)
mineral
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata (CaCO3)
sedimentary
Amethyst (Resin Carving/Orgonite)
Silicon Dioxide (SiO2) with iron impurities
mineral
Ammonite Fossil
Ammonoidea (subclass)
fossil
Fossilized Shark Tooth (Partial)
Elasmobranchii (fossil tooth fragment)
sedimentary
Polished petrified wood
Silicified wood, primarily microcrystalline quartz (SiO₂) replacing organic tissue
fossil
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Fossil Brachiopod
Phylum Brachiopoda
fossil
Bivalve Fossil (Mussel or Clam Shell)
Bivalvia
fossil
Fossilized Wood (with Coal and Limonite)
Petrified Wood (Silicified or Carbonized Flora)
sedimentary
Mookaite Jasper
Radiolarite (Silica, SiO2)
sedimentary
Pearl
Calcium carbonate (CaCO3) as Aragonite or Calcite
mineral
Turquoise and Red Coral
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)
mineral
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Coral Fossil (Petrified Coral)
Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)
sedimentary
Megalodon Shark Tooth
Otodus megalodon
fossil
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin
gemstone
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Fossiliferous Brachiopod in Shale
Brachiopoda (Phylum) preserved in Carbonaceous Shale
sedimentary
Freshwater Pearl
Aragonite / Biogenic Calcium Carbonate (CaCO3)
mineral
Petrified Wood
Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)
fossil
Dendritic Chert
Silicon Dioxide with Manganese Oxide Inclusions (SiO2 + MnO2)
sedimentary
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Cockle Shell Fossil
Cardiidae family (Bivalvia)
fossil
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Fossilized Shark Teeth
Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)
sedimentary (fossilized organic matter)
Fossil Coral (Favosites Honeycomb)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Tumbled blue-green chrysocolla (likely chrysocolla with quartz)
Chrysocolla, hydrated copper aluminum silicate; commonly intergrown with quartz, Cu₂H₂Si₂O₅(OH)₄
mineral
Petoskey Stone
Hexagonaria percarinata
Sedimentary
Fossil Shark Tooth (Cretaceous white shark type)
Squalicorax (commonly known as Crow Shark)
Organic specimen (fossil)
Fossilized Coral (Petoskey Stone or similar Hexagonaria variant)
Hexagonaria percarinata (Fossilized Coral)
sedimentary