Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Chert (specifically Jasper/Flint pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Rhyolite

Rhyolite (Extrusive Igneous Rock)

Yellow Quartzite Pebble

Quartzite (SiO2 with Iron Oxide staining)

Granite

Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Pink Granite (Potassium-rich Granite)

Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O)

Sandstone (Quartzite-rich River Cobble)

Clastic sedimentary rock (primarily SiO2)

Satin Spar (commercially called Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Agate

Chalcedony (cryptocrystalline quartz)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Banded Agate (Pink Chalcedony)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Quartzite (Sugar Quartz)

Quartzite (primarily SiO2)

Quartz / Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Yellow Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Host rock) with Quartz or Calcite amygdules

Petrified Wood

Silicified wood (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Banded Gneiss

Gneiss

Quartz / Quartzite

Quartz (Silicon Dioxide, SiO2)

Chert (specifically Red Chert/Jasper)

Microcrystalline Quartz (SiO2)

Quartzite (River-worn Cobble)

Quartzite (composed primarily of SiO2)

Carnelian (Banded Agate)

Carnelian Chalcedony (SiO2)

Chert (specifically Gray/Blue Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Heliotrope (Bloodstone)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)

Granite Pebble (Salt and Pepper Granite)

Felsic Intrusive Igneous Rock (Granite)

Quartzite

Quartzite (SiO2)

Jasper

Jasper (Silica/Silicon Dioxide, SiO2)

Chert (variant Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Petrified Wood

Silicified Wood (SiO2 permineralization)

Chert (Jasper variety)

Chert (SiO2)

Granite

Phaneritic Acidic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Quartzite

Quartzite (primarily SiO2)

Granite (likely a river or beach pebble)

Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)

Red Jasper (possibly Red Coral or dyed Howlite)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Sandstone (Wonderstone)

Silicified Sandstone / Orthoquartzite with Liesegang rings

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions