Quartzite Pebble
Quartzite (SiO2)
metamorphic
Category
Organic (Non Rock)
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Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2 with iron oxide staining)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pink Quartzite
Quartzite (SiO2)
metamorphic
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Fossilized Wood / Petrified Wood
Petrified Wood (Silicified Flora)
fossil
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2 with iron oxide inclusions
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Black Obsidian
Amorphous volcanic glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass, ~70% SiO2)
igneous
Pyrite and Chalcopyrite in Fluorite Matrix
Calcium Fluoride (CaF2) with Iron Sulfide (FeS2)
mineral
Moonstone with Black Tourmaline
Orthoclase (KAlSi3O8) with Schorl inclusions (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Yellow Jasper
Silicon Dioxide (SiO2)
mineral
Chert (Flint) Artifact
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Green Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Black Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite with Iron inclusions
Quartzite (SiO2 with Fe2O3 trace impurities)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite with Quartz Veining
Meta-quartzite (composed primarily of SiO2)
metamorphic
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Chert (specifically White Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Lace Agate
Silicon Dioxide (SiO2)
gemstone
Limestone (Riprap)
Calcium Carbonate (CaCO3)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Quartzite
Quartzite (SiO2)
metamorphic