Moss Agate
Silicon dioxide (SiO2) with inclusions
Mineral
Category
Organic (Often Found By Beachcombers)
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Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Dinosaur Bone (Gembone)
Silicified Dinosaur Bone (SiO2 replacing organic tissue)
sedimentary
Precious Coral
Corallium rubrum (Calcium carbonate with trace carotene)
Organic gemstone / Sedimentary mineraloid
Chert (variant Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron
sedimentary
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions
mineral
Asphalt (Bituminous pavement)
Bituminous concrete / Asphalt
Sedimentary (Anthropogenic)
Chert (specifically Flint or Novaculite variant)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Black Jasper
Silicon Dioxide (SiO2) with Carbonaceous inclusions
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide) with inclusions - SiO2
mineral
Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert with Limestone Cortex
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)
sedimentary
Dendritic Agate
Chalcedony (SiO2) with manganese/iron oxide inclusions
mineral
Quartzite and Milky Quartz River Pebbles
Silicon Dioxide (SiO2)
metamorphic
Chert (and Flint)
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Fossil Shark Tooth Fragment
Elasmobranchii dentition (fragment)
fossil
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Calligraphy Stone
Fossiliferous Limestone (containing Hematite and Shells)
sedimentary
Amber
Succinate (Fossilized Tree Resin)
gemstone
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Chert (Dark Variety / Flint)
Silicon Dioxide (SiO2)
sedimentary