Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Category
Organic Mineral
Browse organic mineral specimens identified by the Rock Identifier community.
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Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Amber
Amber (C10H16O)
mineral
Petrified Wood
Silicified wood (SiO2)
fossil
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide, SiO2
Mineral
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Shark Tooth Fossil
Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)
fossil
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Ferruginous Sandstone with Concretion
Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary
Chert (with potential fossil inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Pyritic Shale
Carbonaceous Shale with Iron Pyrite (FeS2)
sedimentary
Plume Agate
Silicon Dioxide (SiO2) - Chalcedony Variety
mineral
Fossilized Bark
Lepidodendron / Sigillaria fossil impression
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Green Moss Agate
Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite
mineral
Tree Agate (or Moss Agate)
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Moss Agate and Hematite
Silica (SiO2) with fibrous inclusions of Manganese or Iron; Hematite (Fe2O3)
mineral
Amber
Succinite (fossilized tree resin)
fossil
Amber
Succinite (C10H16O)
Mineraloid
Amber
Succinite (Resinite)
Organic Crystal (Mineraloid)
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
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
Fossilized Brachiopod
Brachiopoda (Phylum)
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
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Selachimorpha (Chondrichthyes dental fossil)
sedimentary
Glauconitic Sandstone
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 in Quartz Sandstone
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary