Chert (Flint) / Silicified Limestone
Microcrystalline Quartz (SiO2)
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 →
Fossil-bearing Sedimentary Rock
Sedimentum cum fossili
fossil
Fossilized Brachiopod
Brachiopoda (e.g., Atrypa or Rhynchonellida)
fossil
Jasper
Jasper (Silicified microcrystalline quartz) - SiO2
sedimentary
Fossil Coral
Hexagonaria or Rugose Coral (Fossilized Calcium Carbonate / Silica)
fossil
Limestone with possible fossil inclusions
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Likely tumbled sandstone or limestone
Quartz-rich sandstone (possibly calcarenite/limestone)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Fossilized Gastropod (Snail)
Class Gastropoda (internal mold or 'steinkern')
sedimentary
Leopard jasper (orbicular jasper)
Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions
metamorphic
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
fossil
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
sedimentary
Fossil Coral (Favosites Honeycomb)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Weathered limestone slab
Micritic limestone, primarily calcite (CaCO₃)
sedimentary
Iron-stained sandstone or weathered ironstone concretion
Quartz-rich sandstone, locally cemented by iron oxides (hematite/goethite); exact identification requires testing
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pink Chalcedony
Silicon Dioxide (SiO2)
mineral
Hag Stone (Holey Rock / Fossiliferous Limestone)
Limestone (CaCO3) with natural erosion / fossil cavities
sedimentary
Chalcedony
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Calcium carbonate matrix with macrofossils (CaCO3)
fossil
Petrified Wood / Jasper Chert
Silicified Wood / Microcrystalline Quartz (SiO2)
sedimentary
Picasso Jasper (Picasso Stone)
Metamorphosed Calcium Carbonate (Silicified Limestone)
sedimentary
Sandstone (Wonderstone)
Silicified Sandstone / Orthoquartzite with Liesegang rings
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
sedimentary
Mookaite Jasper
Silicified Radiolarite (Silicon Dioxide: SiO2)
sedimentary
Carnelian Agate
Chalcedony (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
fossil
Agate
Agate (Cryptocrystalline Quartz)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Vuggy Chert / Silicified Limestone
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Peanut Wood
Silicified (Petrified) Wood - SiO2 (Silicon Dioxide)
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chalcedony
Silicon Dioxide (SiO2)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Chalcedony with Quartz Crystals
Silicon Dioxide (SiO2)
mineral
Fossilized Brain Coral
Diploria labyrinthiformis (Fossilized)
sedimentary
Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chert (containing fossil leaf impression)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Reddish sandstone
Quartz-rich sandstone (arenite), commonly iron-oxide stained
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (SiO2 + varied clasts)
sedimentary