Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus)
fossil
Category
Sedimentary (Silicified Fossiliferous Chalcedony)
Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Shark Tooth
Fossilized Elasmobranchii tooth (likely Odontaspis or Carcharias)
sedimentary
Fossilized Coral
Cnidaria (Hexacorallia)
fossil
Fossiliferous Limestone Pebble
Sedimentary Rock (CaCO3)
sedimentary
Mookaite Jasper
Siliceous sedimentary rock (variety of Jasper/Chert)
Sedimentary Rock
Petrified Wood
Silicified Wood (SiO2)
mineral
Weathered limestone
Calcite-rich carbonate rock (mostly CaCO₃)
sedimentary
Fossil Shell (Brachiopod or Mollusk)
Phylum Brachiopoda or Class Bivalvia (e.g., Mucrospirifer or similar genus)
fossil
Weathered fossiliferous limestone
Bioclastic limestone, chiefly calcite (CaCO₃)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic
Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) - Radiolarite
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Fossil Coral and Quartz Pebble
Fossilized Anthozoa / Silicon Dioxide (Quartz)
sedimentary
Gastropod Fossil (Snail Steinkern)
Class Gastropoda fossil, composed of Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 + varied clasts)
sedimentary
Chert (and Fossiliferous Limestone)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Pyritic Shale
Carbonaceous Shale with Iron Pyrite (FeS2)
sedimentary
Script Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Mixed pebble collection, including likely flint, quartzite, and fossil material
Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Fossilized Coral (Petoskey Stone / Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Tumbled kambaba jasper (likely)
Kambaba jasper, a silica-rich microcrystalline quartz aggregate, commonly containing fossilized cyanobacterial structures and dark green amphibole/pyroxene minerals
sedimentary
Kambaba Jasper (Crocodile Jasper)
Rhyolite containing Fossilized Cyanobacteria (Stromatolite)
sedimentary
Fossilized Wood (with Coal and Limonite)
Petrified Wood (Silicified or Carbonized Flora)
sedimentary
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Coral (Favosites)
Favosites goldfussi / Tabulata
sedimentary
Fossiliferous limestone (likely crinoidal or shell limestone)
Calcite-rich limestone; predominantly CaCO₃, with visible fossil fragments
fossil
Mookaite Jasper
Silicon Dioxide (SiO2) with various mineral inclusions
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Mookaite Jasper
Mookaite (Silicified radiolarite, SiO2)
sedimentary
Polished fossiliferous limestone
Bioclastic limestone, commonly crinoidal limestone (calcite, CaCO₃)
sedimentary
Stromatolite fossil in Chert/Jasper
Cyanobacteria / Microcystis (fossilized)
fossil
Sandstone (with Iron Staining)
Arenite (SiO2 predominantly)
sedimentary
Limestone Pebble with Crinoid Fossil
Calcium Carbonate (CaCO3) - Fossiliferous Limestone
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (order potentially Spiriferida)
fossil