Tumbled agate (likely moss or plume agate)
Microcrystalline quartz, primarily chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Category
Organic Material (Likely A Fruit Or Berry)
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Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Chert
Silicon dioxide (SiO2)
sedimentary
Dalmatian jasper (often sold as Dalmatian stone)
Quartz-bearing leucocratic alkali-feldspar–aegirine/arfvedsonite porphyritic rock; commercial “jasper” designation
igneous
Siltstone with plant fossil impression
Sedimentary rock with Archaeopteris or Calamites flora impression
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Chert (River Siltstone/Flint)
Chert (SiO2)
sedimentary
Tumbled amber
Fossilized plant resin; commonly succinite (organic polymerized resin)
gemstone
Fossilized Shark Tooth
Carcharocles sp. (likely Lemon or Sand Tiger)
sedimentary
Fossilized Bone
Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)
fossil
Chert (often called Jasper or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Weathered Coastal Boulder)
Arenite (composed primarily of SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Crushed Limestone
Sedimentary Calcite/Dolomite Rock (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Chert (variations include Flint/Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Shark Tooth
Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron
sedimentary
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Druzy Chalcedony/Quartz on Fluorite core
Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)
mineral
Limestone (Carved Statue)
Calcium Carbonate (CaCO3)
sedimentary
Red coral beads (possibly dyed or imitation coral)
Corallium spp. skeleton, composed mainly of calcium carbonate (calcite); exact material cannot be confirmed from the image
gemstone
Fossilized Turtle Shell
Testudines fossil
fossil