Sedimentary Rock (Possibly Composed Of Various Minerals)

Travertine (Tufa)

Chemical Sedimentary Limestone (CaCO3)

Turquoise

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

Quartzite (River Pebble)

Meta-quartzite (composed primarily of SiO2)

White Agate (Chalcedony)

Agate (Silicon Dioxide - SiO2)

Schist

Mica Schist

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Green Fluorite

Calcium Fluoride (CaF2)

Fossilized Coral

Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)

Orthoclase (Potassium Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Fluorite

Calcium Fluoride (CaF2)

Chert (Honey Chert or Chalcedony Pebble)

Cryptocrystalline Quartz (SiO2)

Shale

Shale (Lutite)

Greenschist

Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)

Granite Pebble

Granite (Phaneritic Acidic Igneous Rock)

Rock Salt (Halite)

Halite (Sodium Chloride, NaCl)

Shale

Fissile Siliciclastic Sedimentary Rock

Granite

Phaneritic Intrusive Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Quartz (River Siltstone Quartzite Pebble)

Silicon Dioxide (SiO2)

Calcite (Optical Grade/Iceland Spar)

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Biotite Schist

Biotite Schist

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Satin Spar (Selenite)

Gypsum (CaSO4·2H2O)

Pink Calcite (Mangano Calcite)

Calcium Carbonate (CaCO3)

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Malachite

Copper carbonate hydroxide, Cu2CO3(OH)2

Yellow Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Smoky Quartz

SiO2 (Silicon Dioxide)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Garnet (likely Almandine or Pyrope)

Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Jasper

Silicon dioxide (SiO2) with impurities

Watermelon Tourmaline in Quartz Matrix

Elbaite (complex Borosilicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Quartzite (Beach Pebble)

Quartzite (composed primarily of SiO2)

Red Jasper (possibly Chert/Argillite)

Jasper (SiO2) with iron oxide inclusions

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)