Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Category
Organic (Anthropogenic)
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Chert (variant Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossiliferous Brachiopod in Shale
Brachiopoda (Phylum) preserved in Carbonaceous Shale
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Shale with Plant Fossils / Carbonaceous Shale
Laminated Mudrock (Siliciclastic)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structure)
fossil
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Chert (variant Flint/Jasper)
Microcrystalline Opaline Silica (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified wood (Quartz replacement of organic wood structure)
fossil
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement of organic cellulose)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Crushed Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Petrified Wood
Silicified wood (Quartz, SiO2)
fossil
Limestone (Weathered)
Sedimentary carbonate rock, primarily calcium carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Petrified Wood
Silicified Wood (Quartzo-feldspathic fossil wood)
fossil
Banded Chert / Sandstone Pebble
Microcrystalline Quartz (SiO2) / Silicified Sandstone
sedimentary
Ironstone Concretion / Goethite-Hematite Geode
Goethite / Hematite Concretion (Fe3O4 / FeO(OH) / Fe2O3)
sedimentary
Melo Melo Pearl (or Golden Chalcedony / Yellow Jasper Sphere)
Non-nacreous calcium carbonate pearl (or SiO2 - Silicon Dioxide)
gemstone
Mookaite Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2)
mineral
Chert (with Quartz veins)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Fossiliferous Limestone
Limestone (CaCO3 with Limonite/Goethite staining)
sedimentary
Sand Tiger Shark Tooth Fossil
Carcharias taurus (fossilized tooth)
fossil
Chert Pebble (with fossil shell fragment)
Microcrystalline Quartz (SiO2) with Calcified Invertebrate Impression
sedimentary
Calcareous Tufa
Tufa (Calcium Carbonate, CaCO3)
sedimentary
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (Iron-rich Sandstone)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil