Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic (Often Found By Beachcombers)
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Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Brown Variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert / Flint
Silicon dioxide (SiO2)
sedimentary
Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Limestone with Bitumen/Chert
Calcite (CaCO3) containing organic hydrocarbons
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (specifically White Chert or Flint)
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Field Stone)
Chert (Silicon Dioxide, SiO2)
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone with Brachiopod/Crinoid fragments
sedimentary
Chert / Flint
Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂
Mineral
Shungite
Non-crystalline carbon (Fullerenes / Carbon-60)
metamorphic
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Microcrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Common Opal)
Silicon Dioxide (SiO2)
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Fossiliferous Shale
Laminated Mudrock with plant fossils
sedimentary
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Mookaite Jasper
Silicified Radiolarite (SiO2 with iron impurities)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Chert (Yellow Jasper/Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Dragon Blood Jasper
Epidote with Red Piedmontite (Chalcedony/Quartz variant)
sedimentary
Amber
Succinate (Fossilized Tree Resin)
fossil
Fossil Shell Fragment (possibly Brachiopod or Bivalve)
Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca
sedimentary
Amber
Succinite (Fossilized Tree Resin, C10H16O)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Mother of Pearl (Nacre)
Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers
mineral
Chert (and Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions
mineral