Man Made Glass (Often Grouped With Minerals In Lapidary)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3

Amygdaloidal Basalt

Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)

Quartz-bearing Ore (likely Gold-bearing Quartz)

Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)

Ironstone Concretion / Goethite-Hematite Nodule

Goethite/Hematite (α-FeO(OH) / Fe2O3)

Jasper (Multi-color Chert)

Silicon dioxide (SiO2)

Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Chert Nodule in Limestone

Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)

Crazy Lace Agate

Chalcedony (SiO2)

Chert Nodule (Flint)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Quartz Vein in Host Rock (Breccia/Rhyolite)

Silicon Dioxide (SiO2) with matrix

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Sandstone

Arenite (composed primarily of SiO2)

Agate Jasper

Cryptocrystalline Quartz (SiO2) with impurities

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with inclusions of Chlorite or Actinolite

Chert (Flint variety)

Microcrystalline context of Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Greenstone / Serpentinite

Serpentinite (composed largely of Serpentine group minerals, Mg3Si2O5(OH)4)

Yellow Aventurine

Quartz (Silicon Dioxide) with Mica inclusions (SiO2)

Agate Slices and Clear Quartz Points

Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Agate (Geode nodule fragment)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (primarily SiO2 with Fe2O3)

Quartzite River Rock (with Limonite staining)

Quartzite (SiO2)

Ironstone (likely Limonite or Goethite)

Ferruginous sedimentary rock (FeO(OH)·nH2O)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Chert

Microcrystalline silica (SiO2)

Pink Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Blue Apatite

Calcium Phosphate (Ca5(PO4)3(F,Cl,OH))

Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Unakite

Unakite (altered granitic rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Unakite

Epidotized Granite