Chert (variously known as Flint)
Microcrystalline quartz (SiO2)
sedimentary
Category
Organic Mineral
Browse organic mineral specimens identified by the Rock Identifier community.
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Fossil Coral
Cnidaria Anthozoa (Fossilized)
sedimentary
Fossiliferous Limestone (Coquina)
Calcite (CaCO3) with Bioclastic inclusions
sedimentary
Moss Agate
SiO2 (Cryptocrystalline Quartz)
gemstone
Amber (Tumbled/Polished)
Succinite (Fossilized Tree Resin)
mineraloid
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
Amber
Succinite (Resinous fossilized tree sap)
Mineraloid
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (mainly Quartz/Chalcedony, SiO2)
fossil
Amber
Succinite / Fossilized Tree Resin
fossil
Banded Chert / Flint Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Agate (Silicon Dioxide, SiO2) with dendritic inclusions
sedimentary
Green Moss Agate
Silicon Dioxide (SiO2) with Mineral Inclusions
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Jasper-rich)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Fossilized Shark Tooth (Otodus)
Otodus sp. (calcium phosphate/hydroxylellite)
sedimentary
Megalodon Shark Tooth (Partial Fossil)
Otodus megalodon (fossilized in Calcium Phosphate/Apatite)
Mineral/Fossil
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Shungite
Carbon-rich mineraloid (Amorphous carbon)
mineral
Chert (specifically Green Chert/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Ironstone Concretion (Limonite/Goethite)
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. indet.
fossil
Shale
Fissile Mudstone (Shale)
sedimentary
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
fossil
Anthracite Coal
Carbon (with trace impurities)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Moss Agate (Crescent Moon Shape)
Silicon Dioxide (SiO2) with iron/manganese inclusions
mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
mineral
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral