Organic (Non Geological)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2 + Fe2O3)

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Smoky Quartz

SiO2 (Silicon Dioxide)

Red Jasper (possibly Brecciated Jasper or Bloodstone variety)

Jasper (Silicon Dioxide, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Dendrite (Manganese Oxide Dendrites)

Psilomelane or Pyrolusite on Matrix (typically MnO2)

Quartzite (Yellow/Orange variety)

Quartzite (composed primarily of Silica, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Gold in Quartz

Hydrothermal Quartz with Native Gold (SiO2 with Au)

Yellow Jasper

Chalcedony (SiO2) with iron oxide inclusions

Tiger Iron

Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)

Quartz with Mica Schist (Pegmatite Specimen)

SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Vesicular Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock)

Granite

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Ironstone Concretion

Siderite or Hematite-bonded Concretion

Red Jasper

Silicon Dioxide (SiO₂)

Sandstone with Secondary Mineral Encrustation

Arenite with Silica/Calcite deposits (SiO2 or CaCO3)

Quartzite

Quartzite (primarily SiO2)

Ferruginous Conglomerate

Ferruginous Conglomerate (Clastic Sedimentary Rock)

Granite (Specimen: Logan Rock)

Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)

Coquina

Biogenic Limestone

Green Aventurine

Quartz (SiO2) containing Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite

Quartzite (primarily SiO2)

Red Sandstone

Arenite with Hematite cementation

Sandstone (Red Flagstone)

Clastic sedimentary rock (primarily Quartz - SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Bloodstone (also known as Heliotrope)

Silicon Dioxide (SiO2) - variety of Chalcedony

Red Quartzite

Quartzite (primarily SiO2 with trace Fe2O3)

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz (Common Quartz/Crystalline Quartz)

Quartz (Silicon Dioxide, SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Red Jasper

Silicon dioxide (SiO2) with hematite impurities

Aventurine

Quartz (Aventurine variety)

Granite (Pink/Potassium Feldspar Granite)

Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Carnelian Agate

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

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2)