Industrial Byproduct (Anthropogenic Material)

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Blue Quartzite

Quartzite (primarily SiO2) with inclusions like Dumortierite or Crocidolite

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Granite (specifically Rapakivi Granite)

Phaneritic Felsic Igneous Rock (Granite)

Chert (Jasper)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis lazuli (a rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Granite

Granite (Felsic Plutonic Rock)

Granite

Granite (Phaneritic intrusive igneous rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Lapis Lazuli

Lapis Lazuli (Complex silicate mixture including Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Silty Sand / Loam

Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)

Chert

Microcrystalline Quartz (SiO2)

Granodiorite (Gneissic texture)

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Quartz

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite, Na8[AlSi O4]6[S,Cl,SO4,OH]2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Chert / Flint (with Iron Staining)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily Quartz/SiO2)

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (specifically Flint or Jasper-Chert)

Silicon Dioxide (SiO2)

Mica

Phyllosilicate (group name), typically Muscovite KAl2(AlSi3O10)(OH)2 or Biotite K(Mg,Fe)3(AlSi3O10)(OH)2

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Jasper or Brown Chert node)

Microcrystalline Quartz (SiO2)

Dendritic Agate (Tree Agate)

Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions

Granite

Granite (Felsic Plutonic Rock)

Obsidian

Obsidian (principally SiO2)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)

Sandstone (specifically Red Sandstone)

Arenite (SiO2 with Iron Oxide)

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Coquina

Biogenic Limestone

Sandstone (Red)

Arenite (primarily SiO2 with Iron Oxide staining)

Chert Pebble (Yellow/Brown Jasper variety)

Microcrystalline Quartz (SiO2)

Green Calcite (often commercially called Green Onyx)

Calcium Carbonate (CaCO3)