Igneous, Sedimentary, Or Metamorphic (Mineral Based)

Citrine Quartz

Silicon Dioxide (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Graphite

Graphite (Carbon, C)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Turquenite (Dyed Howlite)

Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)

Soapstone

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Quartzite

SiO2 (Crystalline Quartz)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂)

Mineral

Mica (Muscovite)

Muscovite, KAl2(AlSi3O10)(OH)2

Mineral

Banded Gneiss

Gneiss

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Milky Quartz

Silicon Dioxide (SiO2)

Schist with Quartz Vein

Mica Schist with Crystalline Quartz (SiO2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)

igneous

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss (with Quartzite and Biotite)

Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite

Iron Disulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Almandine Garnet

Almandine [Fe3Al2(SiO4)3]

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Quartzite

Quartzite (SiO2)

Mica Schist (with Muscovite)

Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Bull Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Bumble Bee Jasper

Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)

igneous

Sandstone

Arenite (SiO2 based with quartz, feldspar, or lithic fragments)

Dalmatian Jasper (Dalmatian Stone)

Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)

igneous

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Quartz (Clear/White)

Silicon Dioxide (SiO2)