Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)

Biotite (Mica)

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Black Tourmaline

Schorl (Sodium iron aluminum borosilicate), NaFe3Al6(BO3)3Si6O18(OH)4

Serpentine (Nephrite-like River Cobble)

Serpentinite (Hydrous Magnesium Iron Silicate)

Pyrite (Iron Pyrite)

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Quartzite Pebble

Quartzite (primarily SiO2)

Labradorite (tumbled)

Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Basalt with Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Quartzite

Quartzite (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite in Matrix (Fool's Gold)

Iron Disulfide (FeS2)

Gold in Quartz

Hydrothermal Quartz with Native Gold (SiO2 with Au)

Vesicular Basalt

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Biotite / Black Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Graphite Schist

C (Carbonaceous Schist)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Basalt

Basalt (Mafic volcanic rock)

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Turquoise

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

Zircon

Zircon (ZrSiO4)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Ferruginous Sandstone

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Quartz with Mica (Gneissic or Pegmatitic origin)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(F,OH)2)

Rhodolite Garnet

Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3

Milky Quartz (Water-Worn Pebble)

Silicon Dioxide (SiO2)

Magnetite / Ironstone

Magnetite (Fe3O4)

Green Moonstone (Garnierite)

Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)

Quartzite

Quartzite (primarily SiO2)

Sandstone (Quartz-rich)

Clastic sedimentary rock (SiO2 primary)

Granite

Granite (a felsic intrusive igneous rock)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Sandstone

Arenite (composed primarily of SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions (Fe2O3)