Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Category
Organic (Often Found By Beachcombers)
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Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)
mineral
Green Chert
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (River Pebble)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Amber
Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)
Mineraloid
Fossiliferous Limestone with Rugose Coral
Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)
sedimentary
Chert (Jasper/Common Opal mix)
Microcrystalline Quartz (SiO2)
sedimentary
Mosasaur Tooth Fossil
Mosasaurid vertebrate fossil (Hydroxyapatite)
mineral
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Petrified Wood (Agatized/Silicified Wood)
Silicified Paleoxylon (primarily SiO2)
sedimentary
Crushed Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Amber
Succinite (C10H16O)
mineraloid
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Chert / River Pebble
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Green River Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Chert Pebble with Inclusion
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Gray Chert)
Chert (SiO2)
sedimentary
Bamboo Leaf Jasper
Silicified Siltstone or Jasper (SiO2)
sedimentary
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Gray River Pebble (likely Limestone or Siltstone)
Sedimentary Rock (Calcium Carbonate or Siliciclastic)
sedimentary
Moss Agate
Silicon dioxide (SiO2) with mineral inclusions
Mineral
Oak Wood (Wood Grain Pattern)
Quercus (genus)
Organic (Non-rock)
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (with Iron Staining)
Silicon Dioxide (SiO2 / Cryptocrystalline Quartz)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Flint)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
CaCO3 (Calcium Carbonate)
sedimentary
Amber
Succinite (fossilized tree resin)
mineraloid
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (containing Iron Oxide spots)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary