Yellow Jasper
Silicon Dioxide (SiO2) - variety of Chalcedony
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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Limestone with Chert Nodules
Sedimentary Calcium Carbonate (CaCO3) with Microcrystalline Silica (SiO2) inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)
sedimentary
Fossilized Bivalve in Limestone
Class Bivalvia within Sedimentary Matrix (likely CaCO3)
fossil
Gravelly, weathered sediment (likely glacial till)
Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments
sedimentary
Tumbled chert or flint pebble
Microcrystalline quartz (SiO₂), likely chert; exact variety uncertain from the image
sedimentary
Beach sand with a dark pebble
Unconsolidated siliciclastic sediment, chiefly quartz and feldspar; dark pebble likely basalt or volcanic rock
sedimentary
Concretion
Calcareous/Siliceous Concretion
sedimentary
Hag Stone (Chert/Flint with natural perforation)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Polychrome Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicate mineral, SiO2)
sedimentary
Graywacke
Graywacke Sandstone
sedimentary
Polychrome Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal)
sedimentary
Jasper (Picture Jasper variety)
Silicon Dioxide (SiO2) with impurities
sedimentary
Greywacke
Lithic Sandstone (Greywacke)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Fossil Plant Impression (Calamites)
Calamites sp. (Tracheophyta: Equisetopsida)
sedimentary
Cream River Jasper
Silicified microcrystalline quartz (SiO2)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Paleoxylon (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
sedimentary
Belemnite (Fossilized Rostrum)
Belemnitida (Order), composed of Calcite (CaCO3)
sedimentary
Siltstone with plant fossil impression
Sedimentary rock with Archaeopteris or Calamites flora impression
fossil
Shark Tooth Fossil
Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)
fossil
Jasper (likely red/brown jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Brachiopod Fossil in Matrix
Phylum Brachiopoda
fossil
Siltstone
Siltstone (primarily SiO2 with various silicates)
sedimentary
Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).
Galena (PbS)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary