Glauconite (Greensand Articulated Sandstone)
Glauconite ((K, Na)(Fe, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
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Tufa
Calcareous Tufa (CaCO3)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic quartz wacke or arenite
sedimentary
Moqui Marbles
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Fossil Coral
Scleractinia or Anthozoa (Fossilized)
fossil
Amber cabochon pendant
Amber (fossilized tree resin; chiefly polymerized terpenoids)
gemstone
Agate (Moss or Green Agate)
Silicon Dioxide (SiO2)
mineral
Amber
Fossilized tree resin (C10H16O)
gemstone
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Ironstone Concretion / Limonite Node
Goethite and Limonite (FeO(OH) nH2O)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Green and Black Jasper variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Bone Fragment
Vertebrate Fossil
fossil
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Glauconite (Greensand)
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Anthracite Coal
Carbon (with trace impurities)
sedimentary
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (often called Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Fossilized Shell
Invertebrate fossil (Bivalvia or Brachiopoda)
fossil
Flint (chert) with chalcedony/quartz
Microcrystalline quartz, SiO₂; likely flint or siliceous chert with a chalcedonic edge
sedimentary
Likely weathered flint or chert fragment
Cryptocrystalline quartz (SiO₂), possibly siliceous chert/flint
sedimentary
Flint or chert, possibly a knapped stone tool
Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities
sedimentary
Banded chert or flint
Microcrystalline quartz (SiO₂), commonly called chert/flint
sedimentary
Dark gray flint or chert fragment
Microcrystalline quartz (SiO₂), commonly with minor chalcedony and impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Amber
Succinite (fossilized resin, C10H16O)
mineral
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Fossil tooth
Mineralized vertebrate tooth; exact animal and species cannot be determined from the image
fossil
Amber (rough fossilized resin)
Amber; predominantly polymerized fossil plant resin, commonly succinite (C₁₀H₁₆O)
gemstone
Fossilized Bone
Permineralized Vertebrate Fossil
sedimentary