Not A Rock Or Mineral (Anthropogenic Material)

Chert Nodule (Commonly known as Flint or River Rock)

Silicon Dioxide (SiO2)

Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Pink Quartzite

Quartzite (primarily SiO2 with trace Fe2O3)

Granitoid (Granitic Rock)

Granitoid (Quartzo-feldspathic plutonic rock)

Fossiliferous Limestone (Coquina / Shell Conglomerate)

Bioclastic Limestone (composed primarily of CaCO3)

Quartz / Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Serpentine

Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4

Chert (Flint variety)

Chert (SiO2)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with Limonite/Goethite cement

Quartzite River Rock

Quartzite (primarily SiO2)

River Pebble (Basalt)

Basalt (Aphanitic Mafic Igneous Rock)

Quartzite Pebble

Quartzite (SiO2)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Quartz (in a rock matrix)

Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Travertine

Terrestrial Sedimentary Form of Calcium Carbonate (CaCO3)

Chert (Chert / Flint)

Silicon dioxide (SiO2) - Microcrystalline quartz

Quartzite

Quartzite (SiO2)

Chert (Green variety)

Silicon Dioxide (SiO2)

Granite (Pink/Red variety)

Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Serpentine

Serpentine group ((Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4)

Andesite

Andesite (intermediate volcanic rock)

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (primarily SiO2)

Granite (weathered/river-tumbled)

Granite (Plutonic Igneous Rock)

Crushed Granite Gravel

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase Feldspar)

Chert (Field Stone/Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Peridotite

Peridotite (Ultramafic Rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Lapis Lazuli

Lapis lazuli (a rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Granite

Granite (a felsic intrusive igneous rock)

Chert (Pink Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Grey Quartzite Pebble

Quartzite (primarily SiO2)

Chert (Iron-rich or Jasperoid)

Cryptocrystalline Quartz (SiO2)

Chert (often called Flint in dark varieties)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Granite Cobble

Phaneritic Felsic Igneous Rock

Basalt

Basalt (Mafic volcanic rock)

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)