Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
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Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Sandstone with Hematite staining
Arenite with Fe2O3 inclusions
sedimentary
Chert (varietal Flint)
Silicon Dioxide (SiO2)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Blue Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of asbestiform silicates)
mineral
Chert Nodule (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Diorite (Polished Tumble)
Diorite (Intermediate intrusive igneous rock)
Igneous
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement) SiO2
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Red Jasper
Quartz (SiO2) with iron oxide inclusions
sedimentary
Chert Nodules
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide - SiO2)
sedimentary
Chert Nodules
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Dinosaur Bone (Gembone)
Agatized Dinosaur Bone (Silicified Paleo-osteoid)
metamorphic
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Dinosaur Skull Fossil (Velociraptor Replica)
Velociraptor mongoliensis fossil specimen in sedimentary matrix
sedimentary
Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)
sedimentary
Jasper
Silicon dioxide, SiO2
Mineral
Fossil Coral (Rugosa or Solitary Coral)
Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)
sedimentary
Fuchsite in Quartz
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz (SiO2)
metamorphic
Unakite (Epidote-Granite)
Unakite (altered granite containing epidote, orthoclase, and quartz)
metamorphic
Red Jasper
Silicate (SiO2 with Hematite inclusions)
sedimentary
Palm Wood Fossil
Palmoxylon
fossil
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Unakite
Epidotized Granite
metamorphic
Mookaite Jasper
Radiolarite (Silica with iron oxides like Goethite and Hematite)
sedimentary
Sandstone
Arenite
sedimentary
Abalone Shell (Nacre)
Aragonite (CaCO3) - Biogenic Mineral
mineral
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral