Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
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Amber
Succinite (fossilized resin, C10H16O)
mineral
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Lemon (Mock specimen mimicking Citrine/Sulfur)
Citrus x limon
Organic (Biological specimen)
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Mother of Pearl (Nacre)
Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)
sedimentary
Petrified Wood
Silicified Wood (Per mineral content: SiO2, Quartz/Chalcedony)
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Shungite
Non-crystalline carbon (Fullerene-bearing)
mineral
Quartzite river stone
Quartzite (SiO2)
metamorphic
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Amber
Succinite (Formula: C10H16O)
Mineraloid
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) - likely Carcharodon or Otodus genus
fossil
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Xenolith in Basalt
Mafic Igneous Rock with Felsic Inclusion
igneous
Fossilized Wood (Petrified Wood) and Associated Rocks
Silicified Wood / Xylopal
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily Silicon Dioxide, SiO2)
mineral
Enrolled Trilobite Fossil
Phylum Arthropoda, Class Trilobita (likely Calymene or Flexicalymene)
fossil
Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Hornblende inclusions
mineral
Amber
Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Wishing Stone (Quartz Vein in Greywacke / Basalt)
Quartz vein in host rock (e.g. Meta-basalt or Greywacke)
metamorphic
Petrified Wood
Silicified wood (primarily quartz, SiO2)
sedimentary