Organic Material (Likely A Fruit Or Berry)

Chert (specifically Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Biotite (Black Mica)

Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Quartzite pebble

Metamorphic rock (mainly SiO2)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Rhodochrosite

Manganese carbonate (MnCO3)

Caliche (with Lichen Cover)

Calcium carbonate-cemented soil layer (CaCO3)

Limestone (Grey and White specimens)

Calcium Carbonate (CaCO3)

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Sandstone (River Cobble)

Arenite

Quartzite (Gold/Tan River Cobble)

Quartzite (composed primarily of crystalline SiO2)

Jasper and Chert Conglomerate

Ferruginous Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (chiefly SiO2)

Serpentine (Serpentinite)

Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)

Gemstone Sand (Mineral Assortment)

Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)

Red Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Prase Quartz on Feldspar

Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)

Milky Quartz

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)

Sandstone

Arenite (primarily SiO2)

Greenschist

Greenschist (comprising Actinolite, Chlorite, and Epidote)

Milky Quartz (among River Rock)

Quartz (Silicon Dioxide, SiO2)

Banded Iron Formation (BIF)

Magnetite-Hematite Chert (Banded Iron Formation)

Biggs Jasper

Cryptocrystalline Quartz (Silicon Dioxide) - SiO2

Jasper

Silicon dioxide (SiO2)

Banded Iron Formation (Jaspillite)

Banded Iron Formation (BIF) / Jaspillite

US Penny

Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy

Amethyst

Amethyst (Silica mineral, SiO2)

Graphic Granite

Pegmatitic Feldspar with Quartz intergrowths

Jasper

Silicon dioxide (SiO2) with impurities

Green Chert (Jasper)

Silicon Dioxide (SiO2)

Sandstone (Red)

Arenite (SiO2 with Fe2O3)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)

Moissanite

Silicon Carbide (SiC)

Quartzite

Quartzite (SiO2)

Opalite

Man-made glass (traditionally simulated Opal)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Red Granite

Phaneritic Plutonic Rock (High Potassium Feldspar)

Chert (specifically Yellow/Common Opal or Jasper mixture)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)