Limonite-stained Chert
Microcrystalline Quartz (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)
sedimentary
Category
Organic (Anthropogenic)
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Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
metamorphic
Chert (White/Light Tan)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Chert Pebble with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (specifically Tan/Brown Chert)
Chert (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion
sedimentary
Fossilized Coral
Rugose coral / Tabulate coral (Calcium carbonate, CaCO3)
fossil
Chert with Calcite Veining
Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Chert Pebble
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)
sedimentary
Glauconitic Sandstone (or Greensand)
Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Banded Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Green Jasper (with Quartz veining)
Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (likely Brown or Brecciated)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Banded Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood / Xylopal
fossil
Black Beach Pebble (Basalt / Slate Pebble)
Rounded Fine-Grained Clastic / Igneous Rock Pebble
sedimentary
Red Jasper
Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structures, SiO2)
fossil
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Petrified Wood
Silicified Wood (SiO2)
fossil
Green Chert (Jasper)
Microcrystalline Quartz (SiO2) with chlorite/epidote inclusions
sedimentary
Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Gastropod Fossil (Internal Mold)
Phylum Mollusca, Class Gastropoda (Steinkern)
sedimentary
Chert (specifically Jasper or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structure, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary