Pearl
Calcium carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Category
Organic Structure (Not A Rock)
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Chalcopyrite
CuFeS2
mineral
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites (Extinct genus of Tabulate Coral)
sedimentary
Limestone with Bitumen/Chert
Calcite (CaCO3) containing organic hydrocarbons
sedimentary
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Amber Inlay Jewelry
Fossilized Resin (C10H16O)
Organic Gemstone (Biogenic)
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Orthoceras Fossil Limestone
Orthoceras (extinct Cephalopod fossil) in Matrix
sedimentary
Coquina / Shelly Limestone
Coquina (Biogenic Limestone)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Amber
Succinite (C10H16O)
mineral
Amber
Fossilized Tree Resin
gemstone
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Zebra Stone (Banded Chert or Limestone)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Algae Growth
Arenite with Chlorophyta/Lichen
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Gray/Black Chert)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Amber
Succinates
mineraloid
Amber / Copal
Organic resin, C10H16O
mineral
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Picture Jasper
SiO2
mineral
Amber
Succinite (Organic Gemstone)
mineral
Fossilized Shark Tooth (Fragment)
Elasmobranchii (fossilized tooth)
fossil
Fossil Coral (Rugosa or Solitary Coral)
Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Black Jasper (Etched)
Silicon Dioxide (SiO2) with impurities
mineral
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Biological Specimen (Domestic Dog)
Canis lupus familiaris
Organic (Non-rock)
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Petrified Wood
Petrified Wood (Silicified Wood)
fossil