Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Category
Mineral, Organic Gemstone
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Pearl
Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3
mineral
Tufa Rock and Tumbled Gemstones
Calcareous Tufa (Calcium Carbonate, CaCO3)
sedimentary
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Pearl necklace
Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)
gemstone
Moss Agate
Chalcedony (Silicon Dioxide - SiO2) with inclusions
Mineral
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Fluorite
Fluorite (CaF2)
mineral
Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Pearl
Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)
mineral
Agate (Moss or Green Agate)
Silicon Dioxide (SiO2)
mineral
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Amethyst, Aquamarine, and Pearl Ring
SiO2 (Amethyst), Be3Al2Si6O18 (Aquamarine), CaCO3 (Pearl)
gemstone
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Amber
Succinite (fossilized resin)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Amber
Succinite (Fossilized Tree Resin)
gemstone
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pearl
Calcium carbonate (Aragonite/Calcite) - CaCO3
gemstone
Amber (Copal)
Succiniferous Resin
mineraloid
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Jasper (Brown Iron-Rich Variety)
Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)
sedimentary
Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite/Sepiolite inclusions
gemstone
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Fossilized Coral (Petrified Coral)
Lithostrotionella (example genus) / Scleractinia
fossil
Amber
Succinited (fossilized tree resin)
fossil
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Pink Opal
Amorphous Hydrous Silica (SiO2·nH2O)
mineral