Red Jasper
Silicon dioxide (SiO2) with hematite (Fe2O3) inclusions
mineral
Category
Mineral, Sediment
Browse mineral, sediment specimens identified by the Rock Identifier community.
Learn about Mineral, Sediment in the encyclopedia
View all →
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Crinoid Stem
Class Crinoidea (Echinodermata)
sedimentary
Fossil Coral in Limestone
Scleractinia (Anthomastodon or similar) in Sedimentary Calcarenite
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Fossilized ammonite
Ammonoidea (likely a ribbed Jurassic–Cretaceous ammonite), replaced mainly by calcite or silica
fossil
Likely polished dark pebble
Indeterminate; possibly basalt, black jasper, or a dark sulfide-rich stone
mineral
Fossiliferous Chert Nodule
SiO2 (Microcrystalline Quartz) with fossil inclusions
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Mixed River Pebbles and Jasper
Siliciclastic sediment and microcrystalline quartz
sedimentary
Spinosaurus fossil (permineralized bone)
Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)
sedimentary
Jasper
Jasper (Silicate mineral, SiO2)
sedimentary
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Sandstone (Greywacke)
Arenite / Wacke (SiO2 + varied clasts)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Banded Chert
Silicon dioxide (SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron Oxide cement (Fe2O3 / FeO(OH))
sedimentary
Sandstone Concretion
Sandstone (Sedimentary rock, mostly SiO2)
sedimentary
Greywacke with Quartz Vein
Greywacke (immature sandstone) with SiO2 inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Possible weathered mica-rich metamorphic fragment
Mica schist or phyllite (quartz–mica assemblage; identification uncertain from image)
metamorphic
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Polished red jasper (likely brecciated jasper)
Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides
mineral
Tumbled chalcedony (likely milky quartz)
Chalcedony, cryptocrystalline SiO₂; possibly quartz-rich chert
mineral
Weathered iron-rich concretion (probable limonite/goethite)
Limonite–goethite aggregate, approximately FeO(OH)·nH₂O
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Fossilized Shark Tooth (Sand Tiger)
Carcharias taurus (fossil specimen)
sedimentary
Petrified Wood
Silicified Wood (primarily Silicon Dioxide, SiO2)
mineral
Polychrome Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Petrified Wood Fragment
Silicified Wood (SiO2)
fossil
Sandstone Chert Concretion
Silica-cemented Concretion (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary