Sedimentary (Chemically Precipitated) Or Metamorphic

Banded Sandstone (Liesegang Rings)

Sedimentary sandstone with Iron oxide precipitates

Chert Pebble

Microcrystalline quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz (Milky or Smoky Quartz variety)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Banded Calcite (often sold as 'Ocean Jasper' or 'Caribbean Calcite' variant)

Calcium Carbonate (CaCO3) with potential Aragonite inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Tumbled chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert; exact variety uncertain from the image

Azurite in Gossan

Azurite (Cu3(CO3)2(OH)2) in Limonite/Goethite matrix

Travertine (likely polished limestone)

Calcite-rich carbonate rock; predominantly CaCO₃

Moss-covered Rock Fragment

Weathered Rock Fragment with Epilithic Growth

Banded Chert Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Flint / Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (or Flint)

Microcrystalline Quartz (SiO2)

Chert Pebble

Microcrystalline Quartz (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Chert (Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper-like)

Silicon dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Silica Pebble)

Chert (Microcrystalline Quartz, SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

SiO2 (Microcrystalline Quartz)

Siltstone with Weathering Crust

Siltstone (primarily SiO2 with Al2O3)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint/Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper when pigmented)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Chert (Greenish-Grey variety)

Microcrystalline quartz (SiO2)

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Gneiss

Feldspathic biotite gneiss; a high-grade metamorphic rock composed mainly of quartz, feldspar, and mica

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Conglomerate

Conglomerate (a clastic sedimentary rock)

Dragon Stone

Ohko Stone (Argillaceous sedimentary rock)

Quartzite Pebble

Metamorphic Quartzite

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)