Jasper (Iron-rich Microcrystalline Quartz)
Silicon Dioxide (SiO2) with Hematite inclusions
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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Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Yellow Jasper
Opaque Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled orange jasper or iron-rich chert
Microcrystalline quartz (SiO₂), colored by iron oxides
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
River Pebble (Quartzite/Chert)
Silicon Dioxide (SiO2)
sedimentary
Banded Sandstone
Clastic Sandstone (SiO2 with iron oxides)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Amber Inlay Jewelry
Fossilized Resin (C10H16O)
Organic Gemstone (Biogenic)
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)
Elasmobranchii (fossil remains)
sedimentary
Worn quartz-rich pebble, likely chert or quartzite
Microcrystalline quartz (SiO₂), possibly quartzite
sedimentary or metamorphic
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
sedimentary
River Rock (Basalt/Greywacke pebbles)
Fluvial gravel primarily composed of Mafic Volcanic Rock (Basalt) or Lithic Sandstone (Greywacke)
igneous and sedimentary
Rugose Coral Fossil
Order Rugosa
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Chert Pebble / Brachiopod Fossil Internal Mold
Silicon Dioxide (SiO2) / Fossil: Brachiopoda (generic internal mold)
sedimentary
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Red Jasper (Skull Carving)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide inclusions)
sedimentary
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Red Jasper
Jasper (a variety of Quartz, SiO2)
Mineral
Polished striped jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions
sedimentary
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Chalky limestone
Micritic calcite limestone; predominantly CaCO₃
sedimentary
Orbicular jasper (picture jasper)
Silicified volcanic or sedimentary rock; chiefly microcrystalline quartz (SiO₂) with iron-oxide pigments
sedimentary
Banded River Cobble (Argillite or Shale)
Laminated Mudstone / Argillite
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Coral (Honeycomb Coral)
Favosites (extinct genus of tabulate corals), CaCO3 (Calcium Carbonate)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossil Coral
Rugosa or Tabulata coral fossil (Calcite/Silica replacement)
fossil
Petrified Wood
Silicon Dioxide (SiO2) permineralized organic matter
sedimentary