Man Made Object (Metal Alloy)

Black Onyx

Cryptocrystalline Quartz (SiO2) with carbon/iron impurities

Phyllite (possibly low-grade greenish slate)

Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula

Banded Iron Formation

Banded Iron Formation (BIF)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Diamond

Diamond (pure carbon; C)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Quartz

Silicon Dioxide (SiO₂)

Quartzite

Quartzite (primarily composed of SiO O₂)

Sandstone

Arenite (primarily SiO2)

Quartz (likely macrocrystalline variety)

Quartz (SiO₂)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Granite

Granite (a common rock type, not a single mineral species)

Quartz

Quartz (SiO₂)

Garnet (likely Almandine, Pyrope, or a blend)

Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)

Sandstone

Sandstone (lithified sand)

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

Dolomite

Dolomite (CaMg(CO3)2)

Sandstone

Arenite (general term for sandstone)

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Quartz

Quartz (SiO₂)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Quartz

Quartz (SiO2 - Silicon Dioxide)