Pyrite
Iron Sulfide (FeS2)
mineral
Category
Mineral (Organic)
Browse mineral (organic) specimens identified by the Rock Identifier community.
Learn about Mineral (Organic) in the encyclopedia
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Shungite
Shungite (carbon-rich Precambrian mineraloid)
mineral
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Concretion
Septarian Concretion (Fragmentary)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Chert (or Limestone)
Sedimentary Cryptocrystalline Quartz (SiO2) or Calcium Carbonate (CaCO3)
sedimentary
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Petrified wood
Silicified wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Moss Agate
Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2
gemstone
Shark Tooth Fossil
Elasmobranchii dentition (fossilized)
fossil
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
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
Shark Tooth Fossil
Vertebrate fossilized tooth (Chondrichthyes)
fossil
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Selachimorpha (Chondrichthyes dental fossil)
sedimentary
Chert (Jasper variation)
Chert (Cryptocrystalline microcrystalline Silicon Dioxide, SiO2)
sedimentary
Shale
Fissile Mudstone (Shale)
sedimentary
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Likely amber or amber-like resin fragment
Amber (fossilized plant resin), commonly succinite; identification uncertain from the image
gemstone
Polished amber
Fossilized tree resin; chiefly terpenoid polymers (succinite)
organic gemstone
Pearl strand
Nacreous pearl, primarily aragonite (CaCO₃) with conchiolin protein
gemstone
Amber (Tumbled/Polished)
Succinite (Fossilized Tree Resin)
mineraloid
Moss Agate
SiO2 (Cryptocrystalline Quartz)
gemstone
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
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary