Chert (Jasper/Limonitic Chert)
Cryptocrystalline Quartz (SiO2) with Iron Oxide (FeO(OH)) inclusions
sedimentary
Category
Sedimentary Like (Industrial Composite)
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Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (composed mainly of Muscovite / Biotite, Quartz, and Feldspar)
metamorphic
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Chert with Quartz Vein
Microcrystalline Quartz (SiO2) with Macrocrystalline Quartz
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Aragonite (Sputnik habit)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Asphalt Chunk
Asphalt concrete
man-made composite
Bauxite
Bauxite (principal ore of aluminum, primarily Al(OH)3)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Schist
Chlorite/Mica Schist
metamorphic
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Garnet in Schist/Gneiss Matrix
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
metamorphic
Orange Calcite (often commercially sold as Honey Calcite or Aragonite)
Calcium Carbonate (CaCO3)
mineral
Polished jasper pebble (likely brecciated or spiderweb jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and silica vein networks
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Red Sandstone
Arenite (with Iron Oxide pigmentation)
Sedimentary
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Fossil shell impression or shell-bearing limestone
Indeterminate bioclastic carbonate; likely mollusk fragment preserved in limestone or mudstone
fossil
Fossiliferous Limestone (Coral Fossil)
Calcium Carbonate (CaCO3) with Colonial Coral inclusions
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Marble
Recrystallized Calcite / Dolomite (CaCO3)
metamorphic
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Anthracite Coal
Anthracite coal (High-rank coal)
sedimentary
Quartz-rich breccia or silicified rock
Microcrystalline quartz (SiO₂), with iron-oxide staining and possible feldspar/calcite fragments
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich Sedimentary Rock)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Banded Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized bivalve shell fragment
Pectinid or related scallop bivalve; shell originally composed mainly of calcite (CaCO₃)
fossil
Weathered flint or chert fragment
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Garnet Schist
Garnetiferous Micaceous Schist
metamorphic