Chert (often called Flint or Jasper)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Category
Organic Gemstone
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Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Commonly known as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
sedimentary
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Small yellow-orange mineral fragment, likely amber or iron-stained quartz
Possibly amber (fossilized resin; organic mineraloid) or quartz (SiO₂)
mineral
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber / Copal
Organic resin, C10H16O
mineral
Chert (and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Cherty Flint/Jasper variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Black Limestone with Calcite Veining
Bituminous Limestone (CaCO3 with Organic Carbon inclusions)
sedimentary
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Black Chert
Carbonaceous Chert (Silicon dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Anthracite Coal
Carbon (with organic impurities)
sedimentary
Amber
Succinite (Organic Mineraloid)
mineral
Fossilized Shell Fragment
Invertebrate marine fossil, likely calcium carbonate replacement
fossil
Pyrite
Pyrite (Iron sulfide, FeS₂)
Mineral
Shale or Slate
Shale (Sedimentary) or Slate (Metamorphic)
sedimentary or metamorphic
Fossilized Shell Fragment / Mother of Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Amber-like beach pebble
Amber (fossilized tree resin), likely heavily weathered or resinous organic material; exact identification is uncertain from the image
gemstone
Fossiliferous Sandstone
Sedimentary rock containing invertebrate fossils
fossil
Chert (Green and Black Jasper variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Likely bituminous coal
Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image
sedimentary
Graphite-rich metamorphic rock (graphitic schist)
Graphitic schist; chiefly graphite (C), quartz (SiO₂), and mica minerals
metamorphic
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Chert (Jasper variation)
Chert (SiO2)
sedimentary
Amber
Succinates (Fossilized Tree Resin)
mineraloid
Amber
Succinite (C10H16O)
mineral
Petrified Bone (Fossil Bone)
Per mineralization fossil bone (varies by organism, predominantly replacement by SiO2 - Quartz/Chalcedony)
fossil
Petrified Wood / Fossilized Bone
Silicified / Mineralized Fossil (Silica SiO2)
fossil
Jasper containing fossilized inclusions
Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Likely anthracite coal fragments
Anthracite; predominantly carbon (C), with minor mineral ash
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Limestone with Gastropod Fossil
Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion
fossil