Metamorphic (Likely Gneiss Or Schist Based On Texture)

Sandstone with Algae Growth

Arenite with Chlorophyta/Lichen

Quartzite with Quartz Vein

Quartzite (primarily SiO2)

Pumice (likely weathered/water-worn)

Vesicular volcanic glass

Peacock Ore

Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)

Chert (often called Jasper or River Siltstone)

Microcrystalline Quartz (SiO2)

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Porphyritic Basalt

Amygdaloidal Porphyritic Basalt

Magnetite (likely in Hematite or Ironstone)

Magnetite (Fe3O4)

Sandstone

Arenite (primarily SiO2)

Quartz (Milky/Gravel variety)

Silicon Dioxide (SiO2)

Milky Quartz with Epidote or Chlorite inclusions

Silicon Dioxide (SiO2) with inclusions of Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Pink Granite

Granite (Phaneritic intrusive rock)

Yellow Chert (Gold-colored River Pebble)

Microcrystalline Quartz (SiO2) with Limonite/Goethite staining

Granite Cobble

Granite

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Pink Granite with Quartz Vein

Phaneritic Plutonic Felsic Rock (K-feldspar + Quartz + Plagioclase + Mica)

Travertine (Ceramic Tile)

Terrestrial Sedimentary Rock / Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Quartzite

Quartzite (composed mainly of SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 + varied clasts)

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (mainly Silicon Dioxide, SiO2)

Quartzite

Quartzite (primarily SiO2)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Jasper with Quartz Vein

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz

Quartz (SiO2 - Silicon Dioxide)

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Granite

Intrusive igneous rock (Acidic)

Chert (Flint variety)

Microcrystalline Silica (SiO2)

Chert (often called Flint or River Stone)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)

Green Aventurine

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

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Granite Cobble

Granite (Phaneritic Quartz-Feldspar specimen)

Chert Pebble (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Orange Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Granite

Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)