Crystal

Quartz Geode

Silicon Dioxide (SiO2)

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Hematite

Iron(III) oxide (Fe2O3)

Sapphire in a ring

Corundum (Al2O3)

Septarian Nodule (Yellow Calcite in Limestone)

Septarian Concretion (CaCO3 with Aragonite and Calcite)

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz (Herkimer Diamond variant)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Blue Topaz (Cut Gemstone)

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Beryl (likely Aquamarine) in matrix

Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)

Quartz

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (Amorphous SiO2)

Smoky Quartz in Matrix (Pegmatite)

Silicon Dioxide (SiO2) with Potassium Feldspar and Biotite mica

Beryl (likely Emerald or Aquamarine in matrix)

Beryllium aluminum silicate (Be3Al2Si6O18)

Porphyritic Rhyolite (Red Rhyolite)

Rhyolite (Porphyry)

Granite Quartz Blend (Pegmatite or Quartz-rich Granite)

Igneous rock composed primarily of SiO2 (Quartz) with KAlSi3O8 (Feldspar) and (K,Fe,Mg)3(Al,Si4O10)(OH)2 (Biotite)

Blue Kyanite

Kyanite (Al2SiO5)

Granite

Granite (Phaneritic igneous rock)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Rose Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

SiO2 (Silicon Dioxide)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Diorite

Diorite (intermediate intrusive igneous rock)

Pink Tourmaline in Quartz Matrix

Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) with Quartz (SiO2)

Porphyritic Andesite

Andesite (Porphyry)

Granite

Granite (Felsic Intrusive)

Granite with Quartz Vein

Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)

Dalmatian Stone

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Orange Quartz

Crystalline Silicon Dioxide (SiO2) with iron oxide inclusions

Dyed Blue Quartzite

SiO2 (Silicon Dioxide) with artificial colorants

Basalt with Porphyritic Texture

Porphyritic Basalt

Porphyritic Basalt

Porphyritic Basalt (with Plagioclase and Augite phenocrysts)

Red Jasper

Silicon Dioxide with Hematite (SiO2 + Fe2O3)

Fire Quartz (Hematoid Quartz)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Granite

Granite (Phaneritic igneous rock)

Rose Quartz

Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Hematoid Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Porphyritic Rhyolite (Red Porp)

Porphyritic Rhyolite (Felsic volcanic rock)

Quartz Geode

Silicon Dioxide (SiO2) in Geodic habit