Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic Mineral
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Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) - likely Carcharodon or Otodus genus
fossil
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Ironstone Concretion / Limonite Node
Goethite and Limonite (FeO(OH) nH2O)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Fossilized Coral
Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Banded Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Chert with Quartz/Calcite Vein
Microcrystalline Silica (SiO2)
sedimentary
Petrified Wood
Silicon Dioxide (SiO2)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides
mineral
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
sedimentary
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish
mineral
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
sedimentary
Fossil Shark Tooth
Elasmobranchii tooth fossil (e.g., Otodus / Carcharocles)
fossil
Fossilized Sand Tiger Shark Tooth
Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)
sedimentary (fossil)
Chert (specifically Brown Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Amber
Succinite (fossilized resin)
mineral
Moss Agate
Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)
mineral
Amber
Fossilized Tree Resin (C10H16O)
mineral
Shark Tooth Fossil
Otodus obliquus (or similar prehistoric lamniform shark tooth)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Travertine (Tufa)
Chemical Sedimentary Rock / Travertine (CaCO3)
sedimentary
Chert (Jasper-like Silicate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Fossilized Chiton (Polyplacophora)
Polyplacophora (fossilized valves)
mineralized fossil
Fossilized Shark Tooth
Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)
sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2 with iron oxide inclusions
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Banded Chert
Silicon dioxide (SiO2)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 principal component)
sedimentary