Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Category
Organic Mineral
Browse organic mineral specimens identified by the Rock Identifier community.
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Chert (Nodule)
Chert (composition: SiO2)
sedimentary
Chert (often called Flint when in chalk or limestone)
Silicon Dioxide (SiO₂)
sedimentary
Chert (Flinty variety)
Microcrystalline Quartz (SiO2)
sedimentary
Glendonite (Calcite Pseudomorph after Ikaite)
Calcite (CaCO3) pseudomorph after Ikaite (CaCO3·6H2O)
mineral
Jasper (Green Jasper / Chert)
Silicon Dioxide (SiO2 with inclusions)
mineral
Septarian Nodule
Septarian Concretion
sedimentary
Chert (and Limestone Pebbles)
Silicon Dioxide (SiO2) / Sedimentary Microcrystalline Quartz
sedimentary
Fossil Shell (Bivalve)
Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3
sedimentary
Zebra Marble
Metamorphosed Alabaster/Limestone (CaCO3)
metamorphic
Petrified Wood
Silicified wood (permineralized wood)
fossil
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone
mineral
Freshwater Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic composite
gemstone
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Liesegang Ring Siltstone
Siltstone with iron oxide Liesegang bands
sedimentary
Chert (and Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Flint variant)
Chert (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Partial)
Elasmobranchii (fossil tooth fragment)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Mammoth Tooth Fragment
Mammuthus primigenius (or Mammuthus sp.)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal)
sedimentary
Chert (Jasper/Limonitic Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Jasper
Quartz (SiO2) with iron oxide inclusions
sedimentary
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Dinosaur Skull Fossil (Velociraptor Replica)
Velociraptor mongoliensis fossil specimen in sedimentary matrix
sedimentary
Ferruginous Chert
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Fossilized Crinoid Stem Segment
Crinoid (Phylum Echinodermata, Class Crinoidea)
sedimentary
Chert (White Chert)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony replacing $SiO_2$)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shark Tooth (likely Sand Tiger Shark)
Carcharias taurus (fossilized hydroxyapatite/calcium phosphate)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil