Siltstone
Siltstone (composed of clastic quartz and feldspar grains)
Category
Browse organic material (likely a fruit or berry) specimens identified by the Rock Identifier community.
Siltstone
Siltstone (composed of clastic quartz and feldspar grains)
Chert (Jasper)
Microcrystalline Quartz (SiO2)
Jasper
Silicon Dioxide (SiO2)
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Anthracite Coal
Carbon (with trace impurities)
Chert / Flint
Silicon Dioxide (SiO2)
Chert (Nodule)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Chert (SiO2)
Chert (Jasper)
Silicon dioxide (SiO2)
Petrified Wood
Silicified Wood (SiO2)
Petrified Wood
Silicified Wood (SiO2)
Fossilized Shark Tooth
Elasmobranchii fossil (likely Odontaspididae family)
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Fossilized Shell
Invertebrate fossil (Bivalvia or Brachiopoda)
Chert (Common Opal/Jasper mix)
Silicon Dioxide (SiO2) with impurities
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite
Sandstone
Arenite
Onyx (Black) and Mother of Pearl Inlay
Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl
Petrified Wood
Silicified Wood (SiO2)
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
Fossilized Brachiopod
Brachiopoda (Phylum)
Brown Chert
Cryptocrystalline Quartz (SiO2)
Fossil Shark Tooth
Selachimorpha (Chondrichthyes dental fossil)
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
Chert (Flint Nodules)
Microcrystalline Quartz (SiO2)
Chert
Microcrystalline Quartz (SiO2)
Chert (Jasper)
Microcrystalline Quartz (SiO2)
Chert
Chert (Microcrystalline Quartz, SiO2)
Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
Jasper
Jasper (Silicon Dioxide, SiO2)
Bamboo Leaf Jasper
Silicified Siltstone or Jasper (SiO2)
Trace Fossil (Lichenandites or Rhynie Chert Chert with Microfossils)
Trace fossil in microcrystalline quartz (SiO2)
Chert Pebble (Jasper/Quartz variety)
Microcrystalline Quartz (SiO2)
Petrified Wood
Silicified Wood (SiO2)