Horn Coral Fossil
Rugosa (extinct order of solitary corals)
sedimentary
Category
Sedimentary (Silicified Fossiliferous Chalcedony)
Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Silicified Fossiliferous Chalcedony) in the encyclopedia
View all →
Likely weathered gray flint/chert pebble
Microcrystalline quartz (SiO₂), commonly with chalcedony and minor impurities
sedimentary
Chalcedony (likely prehistoric flaked point)
Microcrystalline quartz, SiO₂; possibly green chalcedony or silicified volcanic material
mineral
Petrified Wood
Silicified Wood / Xylopal (SiO2)
fossil
Petrified Wood
Silicified Wood (mainly Quartz / SiO2)
fossil
Petrified Wood
Fossilized Wood (silicified wood)
fossil
Honeycomb Coral Fossil (Favosites)
Favosites alpenensis
sedimentary
Petrified Wood / Red Jasper
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Red jasper (likely tumbled jasper/chert)
Microcrystalline quartz, SiO₂, colored red by iron oxides; exact identification from the photo is uncertain.
sedimentary
Flint (chert), possibly fossil-bearing
Microcrystalline quartz (SiO₂), chalcedony/flint variety
sedimentary
Rounded chert or chalcedony pebble
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Agatized fossil nodule, possibly silicified wood or bone
Microcrystalline quartz (chalcedony), SiO₂, replacing fossil material
fossil
Tumbled quartz-rich pebble, likely jasper or chert
Microcrystalline quartz (SiO₂), possibly iron-stained jasper
sedimentary
Jasper (likely brecciated or chalcedony-rich jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Red Jasper (Skull Carving)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide inclusions)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Ocean Jasper
SiO2, highly silicified rhyolite or spherulitic chalcedony
mineral
Fossil Coral
Rugosa or Tabulata / Hexacorallia (replaced with silica or calcite)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
fossil
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement) SiO2
sedimentary
Polished orbicular jasper pendant
Orbicular jasper (microcrystalline quartz/chalcedony, SiO₂)
sedimentary
Jasper (Mookaite style)
Silicon Dioxide (SiO2) with iron and manganese inclusions
sedimentary
Aquamarine (Pendant) and Jasper (Beads)
Beryllium aluminum silicate (Be3Al2Si6O18) with Chalcedony (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (primarily Quartz or Chalcedony, SiO2)
mineral
Botryoidal chalcedony/geode fragment
Chalcedony (microcrystalline quartz, SiO₂), with possible drusy quartz and iron-oxide staining
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
fossil
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
mineral
Polished jasper
Jasper (microcrystalline quartz, SiO₂), likely brecciated or scenic jasper
mineral
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
sedimentary