Red jasper / iron-rich chert
Microcrystalline quartz (SiO₂) colored by hematite/goethite
sedimentary
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
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Weathered sandstone or siltstone
Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by silica, iron oxides, or carbonate
sedimentary
Chert or chalcedony fragment (possibly agate)
Microcrystalline quartz, SiO₂
sedimentary
Banded Siltstone
Siltstone with rhythmic bedding
sedimentary
Quartz and Mixed Sedimentary Rocks
Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Coral Fossil Rock (Syringopora)
Syringopora (Organ-pipe Coral fossil in Limestone matrix)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (specifically var. Flint or Jasper-rich Breccia)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Greywacke)
Arenite / Lithic Wacke (SiO2 predominant)
sedimentary
Jasper with Iron Staining
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Coprolite
Fossilized Feces
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3-rich mudstone with Calcite/Aragonite veins)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Jasper Pendant
Silicon dioxide (SiO2) with impurities
Mineral/Sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Fossilized Brachiopod Shell / Mold
Phylum Brachiopoda (Fossilized organic matrix replaced by Silica/Calcite)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Tumbled jasper or chert
Microcrystalline quartz (SiO₂), possibly iron-bearing jasper
mineral
Fossilized Shark Tooth
Fossilised Chondrichthyes dental specimen (likely Otodus or Carcharias sp.)
mineral
Mookaite Jasper
Radiolarite (Silica with iron oxides like Goethite and Hematite)
sedimentary
Fossil Belemnite Guard
Belemnitella spp. (rostrum)
fossil
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chocolate Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert Nodule in Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)
sedimentary
Zebra Jasper (Zebra Stone)
Silicon Dioxide (SiO2) with iron oxide and manganese inclusions
sedimentary
River Stone (likely Siltstone or fine-grained Basalt)
Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)
sedimentary or igneous
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Yellow Ocherous Siltstone (Limonitic Shale)
Limonitic Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Tumbled yellow quartz-rich stone, likely yellow jasper or quartzite
Jasper/quartzite; mainly microcrystalline quartz (SiO₂), with iron-oxide staining
metamorphic