Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
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Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Chert (Nodular or Fossiliferous)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Concretion
Septarian Concretion (Fragmentary)
sedimentary
Moss Agate
SiO2 (Cryptocrystalline Quartz)
gemstone
Amber
Succinite (fossilized resin, C10H16O)
mineral
Pearl (incorporated into jewelry)
Aragonite and Calcite (CaCO3)
mineral
Ironstone Concretion (Boxwork)
Siderite-Limonite Concretion (FeO(OH)·nH2O)
sedimentary
Amber
Fossilized Tree Resin
gemstone
Amber
Succinite (Fossilized Tree Resin, C10H16O)
gemstone
Amber
Fossilized tree resin
gemstone
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Mineral (Organic Gemstone)
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral
Amber
Succinite
Organic Gemstone (sedimentary associations)
Banded Siltstone Pebble
Siltstone (primarily SiO2, Al2O3, Fe2O3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Chert (Black Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Fossiliferous Limestone
Limestone (CaCO3 - Calcium Carbonate)
sedimentary
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Amber
Succinite (C10H16O)
mineraloid
Moss Agate
Chalcedony (Silicon Dioxide) with inclusions - SiO2
mineral
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Mineraloid
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Weathered limestone or calcareous fossil fragment
Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone
sedimentary
Chert / Flint (with Crinoid Stem Molds)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
mineral
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
sedimentary
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil