Chert Nodule (Flint)
Cryptocrystalline quartz (SiO2)
sedimentary
Category
Sedimentary (Fossilized Organic Remain)
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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2) with hydration
sedimentary
Coal
Anthracite or Bituminous Coal
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (Sedimentary Rock)
fossil
Quartzite river stone
Quartzite (SiO2)
metamorphic
Fossiliferous Limestone
Sedimentary Limestone (CaCO3) containing Crinoid or Brachiopod remains
fossil
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Chert Concretion with Iron Oxide Staining
Microcrystalline Quartz (SiO2)
sedimentary
Picture Jasper
SiO2
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Chert (Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Concretion
Septarian Concretion (Fragmentary)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Nodule / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Coral / Fossilized Coral
Scleractinia (Anthodiscus / Favia / Montastraea fossil)
fossil
Fossiliferous Chert
Silicon Dioxide (SiO2) with fossil inclusions
sedimentary
Fossilized coral or carbonate fossil fragment
Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)
fossil
Fossilized Stingray Mouth Plate
Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)
fossil
Fossilized Trilobite Pygidium / Glabella Fragment
Trilobita (e.g., Phacops or Ceraurus sp.)
fossil
Fossilized Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata / Rugosa coral (CaCO3)
fossil
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
fossil
Fossilized ammonite (likely weathered ammonite cross-section)
Ammonoidea; commonly Jurassic–Cretaceous ammonite fossils replaced by calcite or aragonite
fossil
Fossilized bivalve shell in limestone
Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock
fossil
Fossilized Favosites Coral (Honeycomb Coral)
Favosites (extinct genus Table Coral)
fossil