Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)

Turquoise

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

Sandstone (Banded)

Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)

Pegmatite (Graphic Granite / Granite Pegmatite)

Coarse-grained intrusive igneous rock (Felsic)

Pyrite

Pyrite (Iron Disulfide), FeS2

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Schist

Schist (Crystalline Metamorphic Rock)

Pegmatite (Granitic)

Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)

Quartzite Pebble

Quartzite (SiO2)

Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Bauxite

Hydrated Aluminum Oxides (primarily Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Rough Green Sapphire (Corundum)

Corundum (Al2O3 - Aluminum Oxide with trace elements)

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Flint

Cryptocrystalline quartz (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Mica

Mica group (often Muscovite or Biotite)

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Pegmatite (Granitic)

Granitic Pegmatite

Greenschist / Chloritaform Schist

Chlorite Schist (Group of Silicate Minerals)

Quartz (likely milky/rose quartz variety)

Quartz (SiO2 - Silicon Dioxide)

Quartzite Cobble

Quartzite (SiO2)

Red Garnet

Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)

Diamond

Diamond (C)

Quartzite

Quartzite (primarily SiO2)

Vanadinite

Lead Chlorovanadate - Pb5(VO4)3Cl

Quartz Cobble (with Iron Staining)

Silicon Dioxide (SiO2)

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Bauxite

Bauxite (mixture of Hydrous Aluminum Oxides)

Wild Horse Magnesite

Magnesite with Hematite inclusions (MgCO3)

Quartzite

Quartzite (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Sandstone with Quartz Vein

Arenite with Crystalline Silica (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Milky Quartz (Beach Pebble)

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Black Tourmaline (Schorl)

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)