Mineral, Part Of A Rock

Chert (or Flint)

Chert (Sedimentary Cryptocrystalline Sio2)

Fossiliferous Chert (with Brachiopod or Mollusk fragments)

Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide staining/cementing)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Basalt with Iron Oxidation

Mafic Igneous Basalt

Chalcedony (Quartz Nodule)

Silicon Dioxide (SiO2)

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Desert Rose (Baryte/Gypsum Rosette)

Baryte (BaSO4) or Gypsum (CaSO4·2H2O)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Banded Agate (Orca Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Lapis Lazuli (Lazurite crystals on Marble)

Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Basalt Pebble with Epidote/Olivine

Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

River Quartz (Milky and Smoky mix)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) - Variety of Chalcedony/Quartz

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with iron impurities

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Carnelian

Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Quartzite (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Travertine

Terrestrial Sedimentary Rock (CaCO3)

Blue Quartzite

Quartzite (specifically a variety enriched with blue-coloring minerals)

Schorl (Black Tourmaline) in Quartz or Feldspar Matrix

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl) in Granitic Pegmatite

Basalt

Extrusive mafic igneous rock

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Carnelian (Agate)

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Blue Kyanite

Kyanite (Al2SiO5)

Sunstone

Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8

Peridot

Olivine ((Mg, Fe)2SiO4)

Milky Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Green Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)