Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Formed From Silica Deposits)
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Chert (often called Flint or Jasper depending on color)
Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)
sedimentary
Rounded quartz-rich river pebble
Likely quartzite or quartz-rich sandstone; exact identification requires testing
sedimentary
Chert (often associated with Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Celestine
Celestine (Strontium Sulfate, SrSO4)
mineral
Yellow Jasper
Chalcedony (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Fossilized Shark Tooth (likely Sand Tiger Shark)
Carcharias taurus (fossilized hydroxyapatite/calcium phosphate)
fossil
Banded Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Pebble)
Microcrystalline to Cryptocrystalline Quartz (SiO2)
sedimentary
Carnelian (Tumbled)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2) with impurities, Microcrystalline Quartz
sedimentary
Agate Nodules
Cryptocrystalline Quartz (SiO2)
mineral
Chert (and Agate/Quartz in Geode-like Nodule)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2) with iron impurities
mineral
Yellow Jasper
Chalcedony (SiO2) with iron oxide inclusions
mineral
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper) pebble
Microcrystalline Quartz (SiO2)
sedimentary
Pink Granite
Phaneritic Quartz-Feldspar Plutonic Rock
igneous
Chalcedony (Agate/Seashell replacement)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Agate
Chalcedony SiO2
mineral
Red Jasper
SiO2 (Microcrystalline Quartz)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Fossil Coral
Scleractinia (Fossilized Hexacoral)
fossil
Chert (Flint Nodules)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Polished/tumbled chert or jasper pebble
Microcrystalline quartz (SiO₂), likely brown jasper/chert
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartz-rich chalcedony (likely silicified rock)
Microcrystalline quartz, SiO₂; possibly silicified limestone or jasper
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled jasper/chert pebble
Microcrystalline quartz (SiO₂), likely jasper or silicified chert
sedimentary
Polished amber-like chalcedony/jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony or jasper; amber cannot be confirmed visually
mineral
Banded Chert
Chert (Silicon Dioxide, SiO2)
sedimentary
Selenite (gypsum)
Gypsum, CaSO₄·2H₂O; transparent or translucent variety commonly called selenite
mineral
Galena
Galena (lead sulfide, PbS)
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral