Knightia Fossil in Limestone
Knightia eocaena in micritic limestone
sedimentary
Category
Organic (Zoogenic)
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Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Fossiliferous Limestone with Rugose Coral
Lithostrotionella (Limestone Matrix - CaCO3)
sedimentary
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Limestone Pebble
Sedimentary carbonate rock (CaCO3)
sedimentary
Amber
Succinite (fossilized tree resin)
mineral
Amber (and Cubic Zirconia)
Fossilized Tree Resin
mineraloid
Moss Agate
Silicon dioxide (SiO2) with inclusions
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)
Phylum Mollusca, Class Bivalvia
fossil
Amber
Succinite (C10H16O)
mineraloid
Limestone with Fossil Inclusion
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Coal (Bituminous or Anthracite)
Carbonaceous sedimentary rock (primarily Carbon, C)
sedimentary
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Megalodon Shark Tooth (Partial Fossil)
Otodus megalodon (fossilized in Calcium Phosphate/Apatite)
Mineral/Fossil
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Amber
Succinite
mineral
Amber
Succinite
Mineraloid
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Fossiliferous Flint
Microcrystalline Quartz (SiO2) with Echinoid Fossil
sedimentary
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Amber
Succinite (Fossilized Resin)
mineral
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Amethyst, Aquamarine, and Pearl Ring
SiO2 (Amethyst), Be3Al2Si6O18 (Aquamarine), CaCO3 (Pearl)
gemstone
Pearl
Organic Mineral (CaCO3 with conchiolin)
mineral
Coquina (Fossiliferous Limestone)
Coquina (Organic Clastic Limestone)
sedimentary
Amber
Succinite (fossilized organic resin)
mineral
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Coal (likely Bituminous or Lignite)
Organic Sedimentary Rock (Carbonaceous)
sedimentary
Fossiliferous Limestone
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Pearl
Calcium carbonate (Aragonite/Calcite) - CaCO3
gemstone
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bone Fragment
Vertebrate Fossil
fossil
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Limestone (with possible Crinoid or Fossil Impression)
Calcium Carbonate (CaCO3) / Calcite
sedimentary
Fossilized Shark Tooth or Bone Fragment
Vertebrate Fossil (likely Carcharodon or similar genus)
fossil