Fossilized Crab Carapace (Concretion)
Decapoda (fossil), typically preserved in calcite or siderite concretion
sedimentary
Category
Organic (Often Found By Beachcombers)
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Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Black Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Megalodon Shark Tooth (Partial Fossil)
Otodus megalodon (fossilized in Calcium Phosphate/Apatite)
Mineral/Fossil
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Pyrite Concretion
Iron Sulfide (FeS2) in Sedimentary Matrix
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodule (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Iron-Stained)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Fossiliferous Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Chert (variations include Flint)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Flint (Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper (Chert)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Gravel Fragment)
Silicon dioxide (SiO2)
sedimentary
Chert (v. Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Moqui Marbles
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (specifically Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (containing Flint and Calcareous inclusions)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) impurities
sedimentary
Chert / Flint Nodules
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Glauconite (Sandstone or Shale)
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Amber
Succinite (Resinite)
fossil
Chert (Jasper variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Agate)
Silicon Dioxide (SiO2)
sedimentary