Synthetic (Man Made Material Mimicking Natural Stone)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Quartz (Iron-stained Quartz)

Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities

Chert (specifically Flint or Dark Chert)

Chert (SiO2)

Chert (often called Flint when dark or worked)

Cryptocrystalline silica (SiO2)

Petrified Wood (Jet or Coalified Wood appearance)

Silicified wood (principally SiO2) or Carbonized Wood

Zebra Jasper (Zebra Stone)

Tumbled Silicon Dioxide (SiO2) with impurities

Apache Tear (Obsidian)

Obsidian (Hydrated Amorphous Silica, SiO2 + MgO/Fe3O4)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite

Petrified Wood

Silicified Wood (SiO2)

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Petrified Wood

Silicified Wood (primarily SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with impurities

Diamond (Cut Specimen)

Carbon (C)

Chert (Pink Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Diamond

Diamond (pure carbon, C)

River Stone / Siltstone

Siltstone (composed of lithified silt)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone Beach Pebble

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)

Strawberry Quartz (Hematoid Quartz)

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Milky or Iron-Stained Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (variable SiO2 with Fe2O3 staining)

Chert (containing Quartz)

Microcrystalline Silica (SiO2)

Sandstone (Ferruginous)

Arenite (Fe2O3 rich)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Chert (often called Flint in this variation)

Silicon dioxide (SiO2) - Microcrystalline quartz

Green Calcite

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartz Mica Schist

Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Tree Agate

Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides

Chert (Nodular)

Cryptocrystalline Quartz (SiO2)

Chert (Agate/Flint variant)

Microcrystalline Quartz (SiO2)

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

Zebra Jasper

Tumbled Opaque Chalcedony (SiO2)