Organic Materia (Not A Rock Or Mineral)

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Gneiss (Banded Gneiss)

Gneiss

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Chert (Gravel)

Silicon Dioxide (SiO2)

Chert (Yellow/Tan variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Arrowhead/Tool variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Chert (often called Flint when dark or worked)

Cryptocrystalline silica (SiO2)

Chert (Yellow variety / Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (SiO2)

Green Chert

Microcrystalline Quartz (SiO2)

Chert (variations include Flint)

Chert (Silicon Dioxide, SiO2)

Red Chert (Jasper)

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Chert (often called Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (Basanite / Flint)

Microcrystalline silica (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline quartz (SiO2)

Chert (specifically as a lithic artifact/projectile point)

Chert (Silicon dioxide, SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Basalt (with possible weathering or secondary mineral crust)

Basalt (Aphanitic Mafic Igneous Rock)

Druzy Quartz

Crystalline Silicon Dioxide (SiO2)

Dalmation Stone (often called Dalmatian Jasper)

Antiperthite-rich Microgranite

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Tiger's Eye (Inlaid in a band)

SiO2 (Silicon Dioxide with Crocidolite inclusions)

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Carnelian Agate Nodule

Silicon Dioxide (SiO2) - Carnelian Chalcedony

Blue Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Banded Agate

Agate (Cryptocrystalline Quartz, SiO2)

Aragonite / Calcite Geode

Calcium Carbonate (CaCO3)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Chert (Iron-rich variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert Nodule (Flint)

Microcrystalline Quartz (SiO2)

Chert (Green variety)

Chert (Silicon Dioxide, SiO2)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Granite

Granite (a felsic intrusive igneous rock)

Granite (Pink/Red Orthoclase variety)

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Milky Quartz

Silicon Dioxide (SiO2)