Kambaba Jasper
Rhyolite (Volcanic rock) or Stromatolite (debated)
Igneous/Sedimentary (debated)
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
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Sandstone
Quartz Arenite
sedimentary
Coquina Jasper
Fossiliferous Chalcedony (SiO2)
sedimentary
Sandstone
Sandstone (principally SiO2)
sedimentary
Fossilized Oyster Shell
Ostreidae (Calcium Carbonate - CaCO3)
fossil
Sandstone
Arenite
sedimentary
Fossiliferous Chert or Limestone
Sedimentary rock containing fossilized marine invertebrates (likely crinoid stems or bryozoans)
sedimentary
Chert Nodules (with Gryphaea or Shell inclusions)
Microcrystalline Quartz (SiO2) with Calcitic inclusions
sedimentary
Kambaba Jasper
Stromatolite (Microbial mat fossil in silicified sediment)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Dendrite (Manganese Oxide Dendrites)
Psilomelane or Pyrolusite on Matrix (typically MnO2)
mineral
Cockle Shell (Bivalve)
Cardiidae (Calcium Carbonate, CaCO3)
fossil
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Petoskey Stone
Hexagonaria percarinata
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda embedded in sedimentary rock
fossil
Sandstone (Banded)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Echinoid Fossil in Flint or Chert Nodule
Echinoidea embedded in sedimentary silica (SiO2)
fossil
Amber
Succinite (Approximate formula: C10H16O)
Mineraloid
Tiger's Eye
Silicon Dioxide (SiO2) - Pseudomorph of Quartz after Crocidolite
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Fossilized Coral (Petoskey Stone or similar Favosites)
Hexagonaria percarinata / Favosites (Silurian-Devonian Coral)
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) - variety of Chert/Jasper
sedimentary
Jet
Lignite (Anthracite-grade compact coal)
sedimentary
Sandstone
Arenite (SiO2 secondary)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Fossiliferous Limestone Pebble
Biogenic Sedimentary Rock (CaCO3)
fossil
Staghorn Coral Specimen
Acropora cervicornis (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Brachiopod in Limestone
Phylum Brachiopoda embedded in sedimentary limestone
fossil
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Cowrie Shell Fossil
Cypraea sp.
fossil
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Favosites Fossil (Honeycomb Coral)
Favosites sp. (Extinct genus of tabulate coral)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Ammonite Fossil
Ammonoidea subclass (calcium carbonate / silica replacement)
fossil
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary