Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Category
Mineral (Organic)
Browse mineral (organic) specimens identified by the Rock Identifier community.
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Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Amber (Copal)
Succinite (fossilized tree resin)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Amber
Succinite (amorphous organic polymer)
mineral
Pearl
Organic Mineraloid (CaCO3 + Conchiolin)
mineral
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral
Amber
Succinite (a fossilized organic resin)
mineral
Amber
Succinite (C10H16O)
mineraloid
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
fossil
Sandstone
Arenite (SiO2 composed primarily of quartz)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Amber
Succinite (fossilized organic resin)
mineral
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Glauconitic Sandstone
Glauconitic Sandstone (Greensand)
sedimentary
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions of hornblende or chlorite
mineral
Mocha Stone (Dendritic Agate)
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
sedimentary
Amber
Succinite (fossilized tree resin)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)
mineral
Fossilized Shark Tooth (fragment)
Elasmobranchii (Class) fossil
fossil
Sandstone with Algae Growth
Arenite with Chlorophyta/Lichen
sedimentary
Polished green moss agate cabochon
Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals
mineral
Amber
Fossilized Tree Resin
gemstone
Amber
Fossilized tree resin
gemstone
Amber
Succinite (Resin)
mineral
Amber
Succinate (Succinite for Baltic varieties)
mineraloid
Amber
Succinite (fossilized tree resin)
mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Amber
Succinite (C10H16O)
mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Coprolite
Fossilized Feces
fossil
Fossilized Vertebra
Chordata fossil (Vertebra)
fossil