Not A Rock Or Mineral (Anthropogenic Material)

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

Olivine in Basalt (Peridotite Xenolith)

Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt

Sulfide Ore (likely Galena and Sphalerite in Quartz)

Lead-Zinc Ore (PbS and ZnS)

Basalt with Quartz/Calcite Vein

Basalt (Mafic Volcanic Rock with secondary mineralization)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Quartz (likely Herkimer Diamond style)

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Natural or Cultured Pearl

Calcium Carbonate (Aragonite and Conchiolin), CaCO3

Pink Cubic Zirconia (CZ)

Zirconium Dioxide (ZrO2)

Peridot in Basalt

Olivine ((Mg, Fe)2SiO4) in Basalt

Rough Quartz (Alluvial Pebbles)

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Rose Quartz

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

Granitic Pegmatite

Granite Pegmatite (coarse-grained intrusive igneous rock)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Petrified Wood

Silicified Wood (SiO2 - Quartz/Chalcedony replacement)

Banded Gneiss

Gneiss (Metamorphic Rock)

Coal (most likely Bituminous or Anthracite)

Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)

Granite Gneiss

Gneiss (High-grade regional metamorphic rock)

Granite (Pink/Red)

Phaneritic Plutonic Felsic Rock (major minerals: Quartz, Orthoclase Feldspar, Plagioclase Feldspar)

Megalodon Shark Tooth (Partial Fossil)

Otodus megalodon (fossilized in Calcium Phosphate/Apatite)

Granite

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

Quartz (Milky/Yellowish variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Dyed Agate

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Copper-bearing Quartz (likely Chrysocolla or Malachite staining)

Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock

Quartz / Common Opal

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

White Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz Druzy Geode

Silicon Dioxide (SiO2)

Carnelian and White Quartz Bracelet

Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz

Lake Superior Agate

Cryptocrystalline Quartz (SiO2)

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Druzy Quartz

Silicon Dioxide (SiO2)

Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Turquoise in Matrix

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Basalt with Amygdules

Amygdaloidal Basalt

Sandstone (likely Greywacke variant)

Arenite

Sandstone

Arenite (SiO2 based)

Turquoise

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O