Chert (Flint nodule)
Silicon dioxide (SiO2)
sedimentary
Category
Organic Mineral
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Calcareous Tufa / Limestone Fragment
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Septarian Nodule (Micro-fragment)
Septarian Nodule / Concretion (CaCO3 + CaMg(CO3)2 + Quartz)
sedimentary
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structure)
fossil
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint/Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (with Lichen)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Greenstone / Chert
Cryptocrystalline Quartz (SiO2) or Altered Basalt
sedimentary or metamorphic
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert (or River Jasper)
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Glauconite (Greensand)
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Chert with Druzy Quartz Geode
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
mineral
Fossiliferous Limestone
Calcite (CaCO3) matrix with biogenic fragments
sedimentary
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Petrified Wood
Silicified wood / Xylopal
fossil
Petrified Wood
Silicified Wood (Quartzo-feldspathic fossil wood)
fossil
Amber
Succinite (Fossilized Resin)
fossil
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Fossil Coral
Phylum Cnidaria / Rugosa or Tabulata
fossil
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Sand Tiger Shark Tooth Fossil
Carcharias taurus (fossilized tooth)
fossil
Calcareous Tufa
Tufa (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Limonite-stained Chert
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (containing bioclasts)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
sedimentary