Polished brecciated jasper
Silicified microcrystalline quartz (chalcedony), commonly called jasper
sedimentary
Category
Sedimentary (Silicified Fossiliferous Chalcedony)
Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified wood (principally Silicon Dioxide, SiO2)
sedimentary
Fossil in Shale
Fossiliferous Shale
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Tan chert or fine-grained sandstone fragment
Microcrystalline quartz (SiO₂), possibly chalcedony-rich chert
sedimentary
Brecciated jasper (likely silicified breccia)
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide matrix and lithic fragments
metamorphic
Botryoidal chalcedony (possible agate or silica sinter)
Microcrystalline quartz, SiO₂
mineral
Chalcedony / milky quartz flake
Microcrystalline quartz (SiO₂), likely chalcedony; possibly a worked quartzite or chert fragment
mineral
Iron-stained jasper (likely orbicular/brecciated jasper)
Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Tumbled orange chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Petrified Wood
Silicified Wood (SiO2 / Quartz pseudomorph after wood)
fossil
Chert (likely flint-bearing chert)
Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)
sedimentary
Fossiliferous Sandstone
Fossiliferous Arenite
sedimentary
Tumbled yellow jasper or silicified rock fragment
Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored
mineral
Red jasper (likely iron-rich chert)
Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite
sedimentary
Quartz-rich pebble, possibly chert or silicified limestone
Microcrystalline quartz (SiO₂), possibly chalcedony; exact identification is uncertain from the photograph
sedimentary
Flint with Fossil
Silicon dioxide (SiO2) microcrystalline quartz with fossiliferous inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
mineral/sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert Nodule (Fossiliferous Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Polished/tumbled brown jasper (likely weathered chert)
Microcrystalline quartz, SiO₂, with iron-oxide impurities
mineral
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Silicified fossil-bearing chert
Microcrystalline quartz (SiO₂), likely chalcedony replacing carbonate shell material
fossil
Tumbled yellow jasper or chert pebble
Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide staining
sedimentary
Polished fossil coral
Fossilized coral, commonly agatized coral (silica replacing CaCO₃)
fossil
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Agatized fossil shell or shell-like chalcedony
Silicified carbonate fossil; microcrystalline quartz (SiO₂) replacing calcite/aragonite
fossil
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Silicified fossil shell, likely fossil oyster or clam
Silicified bivalve fossil; shell originally aragonite/calcite, partly replaced by chalcedony (SiO₂)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Chert or chalcedony pebble (possibly iron-stained)
Microcrystalline quartz, SiO₂; likely chert/chalcedony
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic