Amber
Fossilized Tree Resin
gemstone
Category
Organic Mineral
Browse organic mineral specimens identified by the Rock Identifier community.
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Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite
Mineral (variety of Chalcedony)
Amber
Succinite
mineraloid
Amber
Succinite (C10H16O)
mineraloid
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)
mineral
Seashell Fossil
Gastropoda fossil
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Calligraphy Stone
Fossiliferous Limestone (containing Hematite and Shells)
sedimentary
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline to cryptocrystalline quartz (SiO2)
sedimentary
Polished/tumbled calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Moss Agate
Silicon dioxide (SiO2) with mineral inclusions
Mineral
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Tonsil Stone (Tonsillolith)
Calcium phosphate / Calcium carbonate biomineral
mineral
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Green Sandstone
Glauconitic Sandstone
sedimentary
Fossilized Bone (Petrified Bone)
Permineralized Vertebrate Remains
sedimentary
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Fossilized Shark Tooth
Lamniformes (order) fossil
fossil
Petrified Wood
Silicified wood (principally SiO2)
fossil
Shark Tooth Fossil
Elasmobranchii fossil (likely Carcharias or Odontaspis sp.)
fossil
Fossil Shark Tooth
Odontaspididae (likely Carcharias sp.)
fossil
Petrified Bone Pebble
Silicified Fossilized Bone
fossil
Fossilized Crab Carapace (Concretion)
Decapoda (fossil), typically preserved in calcite or siderite concretion
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Moqui Marbles
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Fossilized Oyster Shell (Limestone/Coquina)
Crassostrea (Fossilized Bivalve), Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz, Chalcedony, or Opal)
sedimentary
Chert (Jasper/Chaldcedony)
Silicon Dioxide (SiO2)
sedimentary
Granite / Feldspar gravel
Granite (felsic intrusive igneous rock)
igneous
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
sedimentary