Bivalve Fossil (Clam)
Class Bivalvia, likely Mercenaria or similar genus
fossil
Category
Sedimentary (Artificial)
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Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Satin Spar (Satin Spar Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz fragment
Silicon Dioxide (SiO2)
mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Chert (or Flint)
Chert (SiO2)
sedimentary
Calcite (Honey Calcite and Agate)
Calcium Carbonate (CaCO3)
mineral
Quartz Geode/Vug in Host Rock
SiO2 (Silicon Dioxide) in various host rocks
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Iron Oxide Concretions
Quartzose Sandstone with Limonite/Hematite
sedimentary
Quartz in Matrix
Silicon Dioxide (SiO2) in host rock matrix
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert / Flint Nodule
Microcrystalline quartz (SiO2)
sedimentary
Fossil Shark Tooth
Phylum Chordata, Class Chondrichthyes (Possibly Cretalamna or Otodus)
fossil
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Fossilized Gastropod Shell
Gastropoda (Class) replacement / internal cast (steinkern)
fossil
Sandstone
Arenite
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Siltstone Pebble
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Fossilized Shark Tooth
Elasmobranchii (Class) fossil
fossil
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Chert (Yellow Jasper)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert with Quartz Veins
Microcrystalline silica (SiO2)
sedimentary
Opal
Hydrated silica (SiO2 · nH2O)
mineraloid
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Fossilized Plant or Tree Bark
Lepidodendron or Sigillaria (example genera)
sedimentary