Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized bone, likely a tooth or jaw fragment
Mineralized vertebrate bone; taxonomic identification requires clearer diagnostic anatomy
fossil
Magnetite
Magnetite (Fe3O4)
mineral
Chert (Common Opal/Agate inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Calamites (Fossilized Horsetail)
Calamites suckowii (Family: Calamitaceae)
sedimentary
Banded Chert
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Galena
Lead(II) sulfide (PbS)
mineral
Chert (with Limestone and Iron Oxide staining)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Chert (Flint variety)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Chert (Flint) Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Script Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Blue chalcedony cabochon (probable)
Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)
gemstone
Coprolite
Fossilized feces (various taxa)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary
Ironstone Nodules (Iron Concretion)
Siderite or Hematite Concretion
sedimentary
Potassium Feldspar (Orthoclase)
KAlSi3O8
mineral
Greenstone / River Siltstone
Metasedimentary Greenstone (Chlorite-rich Siltstone)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Banded Chert (Ironstone type)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Fossil bivalve shell
Fossilized or partially mineralized bivalve; exact genus cannot be determined from the image
fossil
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods), mineralized as Calcite (CaCO3) in Fossiliferous Limestone
sedimentary
White Zircon
Zircon (Zirconium silicate, ZrSiO4)
mineral
Bivalve Fossil (Clam Shell)
Class Bivalvia
fossil
Banded Gneiss
Gneiss
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Magnetite (potentially Lodestone)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert with Jasper/Quartz Inclusions
Silicon Dioxide (SiO2)
sedimentary
Chert (Tripolitic Chert / Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary