Geode (Unopened)
SiO2 (Quartz-filled Sedimentary Nodule)
sedimentary
Category
Organic Mineraloid And Mineral
Browse organic mineraloid and mineral specimens identified by the Rock Identifier community.
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Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Calcite
Calcite (calcium carbonate, CaCO₃), likely massive or crystalline limestone-derived material
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Green Moss Agate
Silicon Dioxide (SiO2) with Mineral Inclusions
sedimentary
Fossilized Shark Teeth
Otodus sp. (Eocene Sand Tiger/Mackerel Shark)
fossil
Shark Tooth Fossil
Carcharocles megalodon or similar fossilized shark tooth
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
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
Pearl
Calcium carbonate (CaCO3) as Aragonite or Calcite
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. indet.
fossil
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Hornblende inclusions
mineral
Amber
Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O
mineral
Moss Agate
Silicon Dioxide (Chalcedony variety)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite (Pseudomorph)
Iron Sulfide (FeS2)
mineral
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Moss Agate
Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2
gemstone
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