Petrified Wood
Silicified wood (SiO2)
sedimentary
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper
Silicon dioxide with iron impurities (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Pyrite Nodule
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified wood (SiO2)
fossil
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Limestone
Calcium carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified wood (Quartz pseudomorph after wood)
fossil
Calcite
Calcium Carbonate (CaCO3)
mineral
Dinosaur Egg Fossil
Fossilized Sauropod or Theropod Egg
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Shark Tooth Fossil
Chondrichthyes fossil
fossil
Graphite
Carbon (C)
mineral
Beach Pebbles and Shell Fragments
Polymictic Gravel and Bioclastic Sediments
sedimentary
Amber
Fossilized tree resin
gemstone
Precious Coral
Corallium rubrum
gemstone
Precious Coral
Corallium rubrum
gemstone
Petrified Wood
Silicified Wood (SiO2)
fossil
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Yellow Jasper
Microcrystalline quartz, SiO2
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Shark Tooth Fossil
Carcharocles megalodon or related shark taxa (Fossilized dentition)
fossil
Petrified wood
Silicified fossil wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Imitation or Cultured Pearl Earrings
Calcium carbonate (CaCO3) or synthetic polymer/glass
gemstone
Petrified Wood
Silicified wood (SiO2)
fossil
Fossilized Fish Vertebra
Vertebrata
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Graphitic schist (probable)
Graphite-bearing mica schist; chiefly quartz, mica, and graphite
metamorphic