Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
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Fossilized Brachiopod
Brachiopoda (Phylum)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Amber
Fossilized Tree Resin
gemstone
Tree Agate (also known as Dendritic Agate)
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Seashell Fossil
Gastropoda fossil
fossil
Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Starfish Fossil
Asteroidea fossil
fossil
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Shale
Fissile Mudstone (Shale)
sedimentary
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Shark Tooth Fossil
Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)
fossil
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Moss Agate (Crescent Moon Shape)
Silicon Dioxide (SiO2) with iron/manganese inclusions
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Petrified Bone (Fossil Bone)
Per mineralization fossil bone (varies by organism, predominantly replacement by SiO2 - Quartz/Chalcedony)
fossil
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
fossil
Red Jasper with Quartz
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of hornblende or chlorite
mineral
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
gemstone
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Amber (Copal)
Succinite (fossilized resin)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Shale fragment
Shale (Laminated Mudstone)
sedimentary