Man Made Material (Anthro Lithic Product)

Rough Agate/Chert Nodules

Cryptocrystalline Quartz (SiO2)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

Limestone

Calcium Carbonate (CaCO3)

Obsidian

Volcanic Glass (predominantly SiO2, approximately 70% or more)

Blue Kyanite

Kyanite (Al2SiO5)

Schist

Mica Schist (variety: Muscovite/Biotite Schist)

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group)

Petrified Wood

Silicified Wood (SiO2)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Quartz

Quartz (Silicon Dioxide, SiO2)

Chalcedony (specifically Agate or Common Opal variety)

Cryptocrystalline Silica (SiO2)

Chert (variations include Flint/Jasper)

Cryptocrystalline Silicon Dioxide (SiO2)

Granitoid (Granitic Rock)

Granitoid (Quartzo-feldspathic plutonic rock)

Jasper (Red/Brown Variety)

Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)

Blue Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Chalk / Sedimentary Limestone

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified wood (Quartz, SiO2)

Mahogany Obsidian

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

Petrified Wood

Silicified Wood (SiO2)

Sandstone (specifically Red Sandstone)

Arenite (SiO2 with Iron Oxide)

Quartzite Pebbles

Quartzite (SiO2)

Granite

Plutonic felsic igneous rock

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Pyrite

Iron Sulfide (FeS2)

Yellow Quartzite

Quartzite (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite (River Cobble)

Quartzite (SiO2)