Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2 / Quartz pseudomorph after wood)
fossil
Fossil Shark Tooth
Odontaspididae (likely Carcharias sp.)
fossil
Chert Nodule in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Dinosaur Fossil Tooth
Vertebrate Fossilized Tooth
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Coral
Scleractinia or Anthozoa (Fossilized)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified wood (principally SiO2)
fossil
Nephrite Jade
Nephrite
Mineral/Rock
Petrified Wood and Mixed Rocks
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Petrified Wood
Silicified Wood (primarily Quartz or Chalcedony, SiO2)
mineral
Chert (Jasper variation)
Chert (Cryptocrystalline microcrystalline Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Fossil Shark Tooth
Selachii (fossilized dentition)
fossil
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Chert (Flint Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Starfish Fossil
Asteroidea fossil
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
mineral
Petrified wood
Silicified fossil wood, commonly quartz/chalcedony (SiO₂) replacing wood
fossil
Weathered limestone or calcareous fossil fragment
Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Mammoth Tooth
Mammuthus primigenius (Tooth fragment)
fossil
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Chert (Green Jasper)
Microcrystalline Quartz (SiO2) with iron silicate inclusions
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Polished ornamental jasper (likely Peanut Wood or similar brecciated jasper)
Microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and clay inclusions
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (Green)
Silicon dioxide (SiO2)
Mineral/Sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Tumbled Red Jasper
Quartz (Microcrystalline variety of chalcedony, SiO2)
mineral
Chalcedony in Matrix (likely Agatized Coral or Chert)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary