Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Category
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Pink Opal
Hydrated silica (SiO2 "n H2O)
mineral
Tufa Rock and Tumbled Gemstones
Calcareous Tufa (Calcium Carbonate, CaCO3)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variously known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinate (Fossilized Tree Resin)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Moss Agate
Chalcedony (SiO2 with inclusions)
mineral
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
mineral
Chert (Yellow Jasper/Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Amber
Fossilized Tree Resin (Succinite for Baltic varieties)
fossil
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
fossil
Sandstone
Sandstone (SiO2-dominated clastic rock)
sedimentary
Chert (Jasper/Chaldcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert (Cloudy Gray)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Otodus)
Otodus sp. (calcium phosphate/hydroxylellite)
sedimentary
Black Limestone
Bituminous Limestone (Calcium Carbonate - CaCO3)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Shale
Fissile Mudstone (Shale)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Amber
Succinite (fossilized tree resin)
fossil
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gravel / Limestone Fragment
Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Rock (Invertebrate Fossil in Matrix)
Fossiliferous limestone or shaly matrix containing skeletal fossil remains
fossil
Chert (Arrowhead Preform or Point)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Fossiliferous Flint
Microcrystalline Quartz (SiO2) with Echinoid Fossil
sedimentary
Shale
Laminated Fissile Pelite
sedimentary
Dendritic Agate (Tree Agate)
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral