Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Category
Organic (Paper And Cellulose)
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Sandy Ironstone
Ferruginous Sandstone
sedimentary
Amber
Succinite (Fossilized Tree Resin)
gemstone
Plume Agate
Silicon Dioxide (SiO2) - Chalcedony Variety
mineral
Weathered River Rock (likely Chert or Basalt with algae)
Silicon dioxide (SiO2) with organic biofilm
sedimentary
Baltic Amber
Succinite (Fossilized Resin)
fossil
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Baltic Amber (Black)
Succinite (Fossilized Tree Resin)
fossil
Dendritic Agate / Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Ferruginous Sandstone (with possible trace fossils)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3)
sedimentary
Shale
Shale (clay-sized silicate minerals)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Coal (Bituminous or Anthracite)
Carbonaceous Sedimentary Rock
sedimentary
Tonsil Stone (Tonsillolith)
Calcium phosphate / Calcium carbonate biomineral
mineral
Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Chert (specifically Blue Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber; fossilized tree resin)
Organic (Sedimentary-associated)
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Petrified wood
Silicified wood, chiefly microcrystalline quartz (SiO₂)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Amber
Succinite (Approximate formula: C10H16O)
mineral
Shale
Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)
sedimentary
Fossiliferous limestone (likely ammonite/gastropod-bearing)
Bioclastic limestone; predominantly calcite (CaCO₃)
sedimentary
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Jasper with Agate and Quartz Inclusions
Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate
sedimentary
Amber Inlay Jewelry
Fossilized Resin (C10H16O)
Organic Gemstone (Biogenic)
Amber (specifically Cherry Amber)
Succinite (with the chemical formula C10H16O)
Organic Gemstone (not a mineral)
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Amber
Succinite (Fossilized Tree Resin) - C10H16O
mineral
Amber
Succinite (C10H16O)
gemstone
Amber
Succinite (Fossilized Resin)
fossil
Pink Opal
Hydrated silicon dioxide (SiO2·nH2O) with inclusions
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Liesegang Ring Siltstone
Siltstone with iron oxide Liesegang bands
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Amber
Succinite (specifically for Baltic amber); Fossilized Tree Resin (C10H16O)
Organic Mineraloid
Agate (Yellow Moss Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Fossilized Sand Tiger Shark Tooth
Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)
sedimentary (fossil)
Amber
Succinite (fossilized tree resin)
mineraloid