Sedimentary (Chemical)

Limestone

Calcium Carbonate (primarily CaCO3 as Calcite or Aragonite)

Quartzite with Sandstone/Iron staining

Metamorphic Quartzite (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Mookaite Jasper

Radiolarite (Silica-rich sedimentary rock featuring Hematite and Goethite)

Rough Quartz (or Quartzite pebble)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Chert (specifically Chert Nodule/Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper/River Pebble)

Silicon Dioxide (SiO2)

Chert / Flint (with Iron Staining)

Silicon Dioxide (SiO2)

Wonderstone (Liesegang Sandstone)

Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))

Microcrystalline Limestone Pebble

Carbonate sedimentary rock (Calcium Carbonate, CaCO3)

Chert Nodule (River Cobble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Grey River Stone (Quartz-rich Quartzite/Siltstone)

Quartzite / Meta-siltstone (primarily SiO2)

Limonite after Pyrite (Prophecy Stone)

Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)

Porphyritic Basalt containing Plagioclase Feldspar phenocrysts

Gneiss

Gneiss (High-grade metamorphic rock)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (Black Chert/Flint)

Silicon Dioxide (SiO2)

Banded Chert (Ironstone/Jasper)

Cryptocrystalline Quartz (SiO2) with Iron Oxides

Chert (Chert / Flint nodule)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Jasper (River pebble)

Jasper / Silicon Dioxide (SiO2)

Chert (specifically Tan/Yellow Chert)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Turquoise

Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Milky or Iron-Stained Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (and Chalcedony/Agate mixture)

Microcrystalline Quartz (SiO2)

Quartz in Matrix

Silicon Dioxide (SiO2)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Aragonite (Onyx Marble)

Calcium Carbonate (CaCO3), Orthorhombic crystal system

Chert (Nodular or Fossiliferous)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Chert (or Banded Jasper)

Silicon Dioxide (SiO2) with Iron Oxide impurities (Hematite/Goethite)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (Nodular)

Chert (SiO2 - Microcrystalline Quartz)

Chert (Hag Stone / Hole Stone)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Glauconitic Sandstone (or Greensand)

Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)