Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Category
Mineral, Organic Gemstone
Browse mineral, organic gemstone specimens identified by the Rock Identifier community.
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Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Black Marble (Veined Limestone/Marble)
Recrystallized Limestone / Metamorphic Calcite (CaCO3)
metamorphic
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Garnet (Almandine-Pyrope)
Almandine-Pyrope Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Tumbled amber
Amber (fossilized plant resin), primarily cross-linked diterpenoid organic compounds
gemstone
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. indet.
fossil
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Hornblende inclusions
mineral
Moss Agate
Silicon Dioxide (Chalcedony variety)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Rough Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite (Pseudomorph)
Iron Sulfide (FeS2)
mineral
Chert (Jasper variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Shark Tooth Fossil
Elasmobranchii dentition (fossilized)
fossil
Fossilized Shark Tooth (Root Portion)
Selachimorpha (partial specimen)
fossil
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Glauconite (Greensand Articulated Sandstone)
Glauconite ((K, Na)(Fe, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Fossilized Brachiopod
Brachiopoda (Phylum)
fossil
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Mammoth or Mastodon Tooth Fossil
Mammuthus / Mammut tooth
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth (Chondrichthyes)
fossil
Fossil Shark Tooth
Selachimorpha (Chondrichthyes dental fossil)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Amber
Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)
Organic Mineraloid
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Mineraloid
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
organic mineraloid
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Vuggy Limestone
Calcium Carbonate (CaCO3) with Quartz/Calcite inclusions
sedimentary
Bivalve Fossil (Clam Stone)
Phylum Mollusca, Class Bivalvia
fossil
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Amber
Fossilized Tree Resin (Succinite for Baltic varieties)
fossil