Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Organic (Paper And Cellulose)
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Bamboo Leaf Jasper
Silicified Siltstone or Jasper (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz replacement, SiO2)
fossil
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral
Sandstone (with Moss)
Quartz Arenite / Sandstone
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary
Chert Pebble
Chert (SiO2)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral
Chert (Flint Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Pearl
Calcium carbonate (CaCO3) + organic conchiolin
gemstone
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Amber (Copal)
Succinite (fossilized tree resin)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Fossiliferous Sandstone
Sedimentary rock containing invertebrate fossils
fossil
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Limestone with Gastropod Fossil
Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion
fossil
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
gemstone
Freshwater Pearl
Aragonite / Biogenic Calcium Carbonate (CaCO3)
mineral
Garden Quartz (Lodolite / Inclusion Quartz)
Quartz with inclusions (SiO2 with various mineral inclusions)
gemstone
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Fossilized Chiton (Polyplacophora)
Polyplacophora (fossilized valves)
mineralized fossil
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Coal (Bituminous or Anthracite)
Carbonaceous sedimentary rock (primarily Carbon, C)
sedimentary
Limestone Pebble
Sedimentary carbonate rock (CaCO3)
sedimentary
Amber
Succinates (Fossilized Tree Resin)
mineraloid
Amber
Fossilized Tree Resin
gemstone
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Amber
Succinates
mineraloid
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Moss Agate
Silicon Dioxide (Chalcedony variety) with green hornblende or chlorite inclusions - SiO2
gemstone
Amber
Succinite (fossilized tree resin)
mineral
White Coral
Corallium rubrum (biocarbonate calcium) / CaCO3
mineral
Amber
Amber (Fossilized Tree Resin)
mineral
Limestone with Fossil Inclusion
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (fossilized resin)
mineral
Fossilized Bone
Permineralized Vertebrate Bone
fossil